A Belgian quad, or quadrupel, is a strong, dark Belgian-style ale with deep malt, dried-fruit notes, and a warming finish. This homebrew version uses pale malt, specialty grains, dark Belgian candi syrup, and Belgian yeast to make a full-bodied beer suited to slow sipping and careful fermentation.
Quadrupel is a modern beer-style name associated with Belgian brewing; individual breweries make their own versions, so color, sweetness, and spice can vary. This recipe makes 5 gallons (19 L), roughly 53 servings of 12 fl oz (355 ml). It is an alcoholic drink for adults of legal drinking age; enjoy responsibly.
Ingredients
- 11 lb (5 kg) Belgian pilsner malt
- 1 lb 8 oz (680 g) Munich malt
- 1 lb (454 g) aromatic malt
- 12 oz (340 g) Special B malt
- 8 oz (227 g) CaraMunich malt
- 2 lb 8 oz (1.13 kg) dark Belgian candi syrup, preferably around 180 SRM
- 8 gal (30 L) brewing water, divided: about 5.5 gal (21 L) for mashing and 2.5 gal (9.5 L) for sparging; adjust to your equipment and target volume
- 1 oz (28 g) Magnum hops, about 12% alpha acids, for bittering
- 2 packets (about 22 g total) dry Belgian strong-ale yeast, or an appropriately sized liquid-yeast starter
- 1 tsp (4 g) yeast nutrient, optional, added near the end of the boil
- 4.5 oz (128 g) corn sugar (dextrose) for bottle conditioning
- 2 cups (475 ml) water for dissolving the bottling sugar
Instructions
- Clean, sanitize, and prepare the water. Clean all equipment that will touch the wort or beer, then sanitize the fermenter, lid, airlock, tubing, and any transfer equipment according to the sanitizer directions. Heat the mash water to suit your system so the mixed grain settles at 149°F (65°C). Keep the sparge water separate and plan to heat it to about 168°F (76°C). A reliable thermometer and a hydrometer or refractometer make this strong beer much easier to manage.
- Mash the grains for 60 minutes. Mill the malt if it is not already milled. Stir the crushed pilsner, Munich, aromatic, Special B, and CaraMunich malts into the mash water thoroughly, breaking up dry pockets. Hold the mash close to 149°F (65°C) for 60 minutes. This relatively moderate mash temperature helps create a fermentable wort while leaving enough body for a strong, rich ale. Check the temperature in more than one spot; gently adjust the heat or add a little hot water if needed.
- Raise the mash and collect the wort. Raise the mash to 168°F (76°C) for 10 minutes, stirring carefully. Drain the wort into the kettle, then rinse the grain slowly with the 2.5 gal (9.5 L) of sparge water. Collect about 7 to 7.5 gal (26.5 to 28 L) before boiling, or follow the volume marks for your kettle and expected evaporation. Do not squeeze a brew bag so hard that grain particles enter the kettle; a little cloudiness is harmless, but husk material can contribute astringency.
- Boil for 90 minutes. Bring the wort to a steady boil and add the Magnum hops at the start of the boil. Watch the kettle closely as it approaches a boil because malt wort can foam over. Boil uncovered for 90 minutes to concentrate the wort and help drive off unwanted volatile compounds from the pilsner malt. Add the yeast nutrient, if using, during the final 10 minutes. Stir in the dark candi syrup until fully dissolved, taking care not to scorch it on the bottom of the kettle.
- Cool the wort and measure it. Chill the wort promptly to about 66°F (19°C) using a sanitized immersion chiller or another suitable method. Keep the kettle covered as much as practical while cooling. Transfer the cooled wort to the sanitized fermenter, leaving behind most of the hop debris and settled material. Add cool, clean water if needed to reach 5 gal (19 L), then take an original-gravity reading. A result around 1.090 to 1.100 is a reasonable target; the precise number depends on malt efficiency and evaporation.
- Pitch yeast and ferment for about 21 days. Aerate the wort well before pitching because a high-gravity wort needs a healthy yeast start. Add the yeast according to its package directions, fit the airlock, and hold the fermenter near 66°F (19°C) for the first two or three days. If fermentation is active and temperature control allows it, gradually let the beer rise to 72–75°F (22–24°C) over the next week. Keep it out of direct sunlight and avoid opening the fermenter unnecessarily. Leave it in primary fermentation for about 21 days, then check gravity on two readings taken three days apart. It should be stable before packaging; if it is still falling, give it more time.
- Let the beer mature for 14 days. Once gravity is stable, leave the beer in the sealed fermenter for another 14 days at a steady, cool room temperature. This short maturation period lets the yeast finish cleaning up fermentation flavors and allows some yeast and sediment to settle. Avoid transferring to a secondary vessel unless you have a specific reason; unnecessary transfers expose beer to oxygen and can dull its malt and fruit character.
- Prepare the priming solution and bottle. Sanitize bottles, caps, siphon, and bottling equipment. Bring the 2 cups (475 ml) of water to a boil, stir in the 4.5 oz (128 g) dextrose until dissolved, and cool the solution covered. Siphon the beer gently into a sanitized bottling bucket, avoiding splashing, and mix in the priming solution evenly without stirring up the sediment. Fill bottles with a small headspace and cap them. This quantity aims for moderate carbonation; use a priming-sugar calculator if your actual packaged volume or desired carbonation differs.
- Condition the bottles for at least 14 days. Store capped bottles upright in a dark place around 68–72°F (20–22°C) for 14 days, then chill one bottle and check the carbonation. Strong beers can carbonate slowly, so allow another week or two if the beer is still under-carbonated. Chill bottles before serving and pour carefully, leaving the yeast sediment in the bottom of the bottle if you prefer a clearer glass.
Tips
- Use dark candi syrup for the right depth. Belgian candi syrup is a specialty ingredient that contributes dark fruit and caramel-like flavors without adding much body. If you cannot find it, use 2 lb 8 oz (1.13 kg) of dark muscovado sugar as a practical substitute. The result will be less complex and may taste more molasses-forward; avoid replacing it with ordinary white sugar if you want the characteristic dark malt profile.
- Plan for a healthy fermentation. A strong wort puts more stress on yeast than an ordinary-strength ale. Use fresh yeast, pitch enough for the batch, aerate before pitching, and control the fermentation temperature. If using liquid yeast, make a starter sized for a high-gravity 5-gallon batch rather than relying on one small vial.
- Do not rush gravity checks or bottling. Airlock activity is not a reliable way to tell whether fermentation is finished. Confirm stable gravity readings several days apart before adding priming sugar. Bottling too early can cause over-carbonated bottles, so wait if the readings are still changing.
- Protect the beer from oxygen. Once fermentation is complete, transfer quietly and keep splashing to a minimum. Oxygen exposure can make a dark, malt-forward ale taste stale or papery over time. Use sanitized equipment, but do not shake or vigorously stir the beer after fermentation.
Serving Suggestions
Serve this quad in a tulip glass or another glass with a gently narrowing rim, which helps concentrate its aroma. Chill it to about 50–55°F (10–13°C) rather than serving it ice-cold; a little warmth makes the malt, dried-fruit, and yeast character easier to notice. Pour slowly into a clean glass, leaving the final yeast sediment behind if you want a clearer pour. A small serving is often more comfortable than a full pint because the beer is strong and richly flavored.
Its sweet-dark malt character works well with aged cheeses, roasted nuts, dark chocolate, and slow-cooked beef or lamb. It can also accompany a dessert with dried fruit or caramel, provided the dessert is not so sweet that it overwhelms the beer. For a simple tasting, serve it with a mild cheese and plain bread so the beer remains the focus.
Variations
Make it a little lighter: Replace the 12 oz (340 g) Special B with 12 oz (340 g) additional Munich malt. The beer will have less raisin-like depth and a gentler dark-fruit note, while retaining a malty Belgian profile.
Adjust the color and roast character: For a darker, more caramelized impression, replace 4 oz (113 g) of the CaraMunich with 4 oz (113 g) of chocolate malt. This adds a subtle cocoa edge, so keep the amount modest; too much can make the beer taste roasty rather than rounded and fruity.
Use a different bittering hop: If Magnum is unavailable, use a clean bittering variety such as Northern Brewer or a suitable local equivalent. Calculate the weight from the package alpha-acid percentage to aim for roughly 25–30 IBUs. The hop should balance the malt rather than dominate the aroma.
Choose a different yeast expression: A Belgian strong-ale yeast that emphasizes fruit will give a more expressive, fruity result, while a cleaner Belgian strain can leave the malt and syrup flavors more prominent. Follow the strain’s recommended temperature range, since fermentation temperature strongly affects the finished aroma.
Storage and Reheating
Beer is not reheated. Keep sealed bottles in a cool, dark place, ideally around 50–60°F (10–16°C), and refrigerate individual bottles before serving. Properly sealed, well-conditioned beer can hold its quality for several months; flavor will gradually change, especially if bottles are stored warm or exposed to light. Refrigerate opened beer and drink it within a day or two for the best carbonation and aroma. Keep bottles upright so sediment settles at the bottom, and handle highly carbonated bottles gently.
Frequently Asked Questions
What does “quad” mean in a Belgian beer recipe?
A quad, short for quadrupel, is a strong Belgian-style ale rather than a precise measure of ingredients or alcohol. It is usually darker and richer than many Belgian blond ales, with substantial malt character and a warming strength. Brewers differ in how sweet, dry, fruity, or dark they make it.
How strong is this recipe likely to be?
With an original gravity around 1.090–1.100 and a healthy fermentation, expect a beer in the neighborhood of 9–11% alcohol by volume. The exact result depends on your brew-house efficiency, final gravity, yeast performance, and actual batch volume. Use gravity readings to estimate the finished strength rather than relying on the recipe estimate alone.
Can I make this with malt extract instead of grain?
Yes, but it requires a reformulated extract recipe rather than a direct one-for-one swap. The grain bill here supplies both fermentable sugars and specialty-malt flavor, so replacing every malt with pale extract would lose much of the intended complexity. A partial-mash version can steep the specialty malts and use enough pale malt extract to reach the target original gravity.
Why is my fermentation taking longer than three weeks?
High-gravity beer can ferment slowly, and yeast strain, pitching amount, temperature, and wort oxygenation all affect the timeline. Use stable gravity readings to decide when fermentation is complete, not a calendar date or a quiet airlock. If gravity is still dropping, leave the beer in the fermenter and check again after several days.
Can I keg this instead of bottling it?
Yes. Transfer the finished beer into a clean, sanitized keg with minimal splashing, then carbonate it to your preferred level using your keg system. The 14-day bottle-conditioning wait does not apply to forced carbonation, though the beer can still benefit from extra maturation time before serving.
How do I know whether a bottle is over-carbonated?
Unexpectedly forceful foam, a gush when opened, or unusually hard bottles can indicate excess carbonation. Chill bottles thoroughly and open them carefully, pointed away from people. If the beer was bottled before gravity had stabilized, pressure can continue to rise; do not leave questionable bottles warm or handle them roughly.
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