Danish Sourdough Rye Bread Recipe with Seeds and Caraway

Danish sourdough rye bread, often called rugbrød, is a hearty, close-crumbed loaf made with rye flour, a lively sourdough starter, and seeds. This version includes soaked cracked rye for a pleasantly chewy texture and is baked in a loaf pan, then cooled thoroughly before slicing for open-faced sandwiches or toast.

Ingredients

1 1/2 cups (255 g) cracked rye berries or coarse cracked rye
1 1/4 cups (300 ml) boiling water, for soaking
1 cup (240 g) active, ripe rye sourdough starter, at 100% hydration
1 cup (240 ml) lukewarm water
2 cups (240 g) whole rye flour
1 cup (125 g) bread flour
2 tablespoons (40 g) dark molasses
2 teaspoons (12 g) fine salt
1/2 cup (65 g) raw sunflower seeds, plus 1 tablespoon (8 g) for the top
2 tablespoons (20 g) whole flaxseeds
1 tablespoon (6 g) caraway seeds
1 teaspoon neutral oil or softened butter, for greasing the pan

Instructions

Soak the cracked rye. At least 8 hours before mixing the dough, put the cracked rye in a heatproof bowl and pour over the boiling water. Stir, cover, and leave at room temperature for 8 hours. The grains will absorb much of the water and soften. Do not drain the bowl; the remaining liquid belongs in the dough. This soaking step helps prevent hard, dry bits in the baked loaf.
Prepare the pan and check the starter. Grease a 9-by-5-inch (23-by-13-cm) loaf pan well, including the corners. Line it with a strip of baking parchment if you want easier removal. Your starter should be bubbly, pleasantly tangy, and recently fed; a spoonful should look aerated rather than flat and separated. If it is sluggish, give it time to become active before starting, since a weak starter can leave this dense dough under-risen.
Mix the dough. In a large bowl, stir together the starter, lukewarm water, and molasses. Add the soaked rye and all its soaking water. Mix in the rye flour, bread flour, salt, sunflower seeds, flaxseeds, and caraway until no dry patches remain. The mixture will be very thick, sticky, and more like a heavy paste than a kneadable wheat dough. That is normal: rye develops differently from wheat, and kneading by hand will not make this dough smooth or elastic.
Let the dough ferment. Cover the bowl and leave it at a comfortably warm room temperature, ideally around 70–75°F (21–24°C), for 3 hours. Rye dough may not double in size; look for a modest rise, a few small bubbles, and a lighter, slightly aerated surface. If your room is cooler, fermentation can take longer, so follow the dough’s appearance rather than forcing it to match the clock. Avoid repeated vigorous stirring, which can knock out the gas that has formed.
Fill the pan and proof. Scrape the dough into the prepared pan. Wet a spatula or your fingers and press it gently into the corners, smoothing the top. Scatter the reserved sunflower seeds over it and press them lightly so they stick. Cover the pan loosely and proof for about 2 hours at room temperature. The dough should look a little puffier and may show tiny pinholes at the surface, but it will not rise like a white sandwich loaf. If it has already risen substantially and looks fragile, bake it rather than waiting for the full time.
Bake the loaf. Heat the oven to 425°F (220°C). Bake for 15 minutes, then reduce the oven temperature to 375°F (190°C) without opening the door and continue baking for 55 minutes. The top should be dark and firm, and the loaf should feel set at the center. For a useful doneness check, an instant-read thermometer inserted into the middle should register about 205–208°F (96–98°C); this is a bread-quality guide, not a meat safety temperature. If the top is darkening too quickly, loosely cover it with foil for the remaining bake.
Cool completely before slicing. Set the pan on a rack for 10 minutes, then loosen the edges and lift out the bread. Let it cool on the rack until it has cooled for 8 hours in total. This long cooling period allows the moist rye crumb to finish setting. Slicing while warm can make the center look gummy even when the loaf is fully baked. Use a long serrated knife and a gentle sawing motion to cut neat slices.

Tips

Use a truly active starter. A starter that has recently risen after feeding gives the loaf its lift and sourdough flavor. If yours is wheat-based rather than rye-based, it will still work; the bread may have a slightly milder rye character. The recipe assumes a 100%-hydration starter, made with equal weights of flour and water.
Choose the right rye texture. Cracked rye berries are coarsely broken rye kernels, not whole hard berries. If you can only find whole rye berries, simmer them in water until tender, drain well, and measure out 255 g before mixing. Rye flakes can replace cracked rye, but they soften more and give a less chewy, more uniform crumb.
Expect a sticky dough. Adding extra flour to make it feel like ordinary bread dough can make the loaf dry and heavy. Wet hands and a damp spatula are more helpful for transferring and smoothing it. Use the pan size listed so the center bakes through in the stated time.
Give it time to cool. The long wait is part of the method, not an optional flourish. If you cut the loaf early, moisture can collect on the knife and compress the slice. A serrated bread knife also helps keep the seeded crust intact.

Serving Suggestions

Serve thin slices as Danish-style smørrebrød, the open-faced sandwiches associated with Danish meals. Try a slice with butter, aged cheese, sliced cucumber, radishes, or pickled vegetables; for a more substantial topping, add cooked egg or leftover roast meat. Keep toppings simple enough that the tangy rye and caraway remain noticeable. The firm crumb also makes sturdy toast: toast a slice lightly, then add butter, honey, or a savory spread. For a casual meal, offer a basket of slices alongside soup or a salad. Because the loaf is filling and dense, thin slices are usually more practical than thick cuts.

Variations

For a more pronounced sour flavor, let the covered dough ferment in a cool room for longer, checking for the modest rise and bubbles described above; do not leave it until it collapses. For a seedier loaf, replace up to 2 tablespoons of the sunflower seeds with pumpkin seeds or sesame seeds. Pumpkin seeds make the crumb more substantial, while sesame adds a toasty flavor. If you do not enjoy caraway, omit it or use 1 teaspoon of fennel seeds for a gentler, slightly sweet aroma.

For a loaf with less chew, use rye flakes in place of cracked rye, keeping the same weight and soaking them as directed. You can also replace the bread flour with an equal weight of all-purpose flour; the loaf may be a little less sturdy, but it will still slice well after its full cooling time. For a fully rye version, use rye flour instead of the bread flour, but expect a tighter, more fragile crumb and a dough that may need extra proofing time. Keep the pan size and bake temperature the same, and judge the rise by appearance.

Storage and Reheating

Once the loaf is fully cool, wrap it tightly or place it in an airtight container. It keeps well at room temperature for about 3 days; a cool, dry spot is better than a warm kitchen. Do not seal it while warm, since trapped steam softens the crust and can make the crumb damp. For longer storage, slice the loaf, separate slices with parchment if desired, and freeze them in a freezer-safe bag for up to 3 months. Remove slices as needed and toast them straight from frozen, or thaw them at room temperature. A whole loaf can also be frozen, though individual slices are quicker to use. Refrigeration is not ideal for keeping bread fresh because it can make the crumb stale faster.

If you want a warm slice, toast it or heat it briefly in a 350°F (175°C) oven. Bread is best refreshed only for the portion you plan to eat; repeated warming can dry it out. Discard bread if you see mold rather than cutting around the affected patch.

Frequently Asked Questions

Can I make this without a sourdough starter?
This recipe is designed around active starter, which contributes fermentation and flavor, so ordinary yeast is not a direct one-for-one swap. A yeast-based rye loaf needs a different amount of liquid and a different rising schedule. If you do not have a starter, use a recipe developed specifically for commercial yeast rather than guessing at a substitution.

Why didn’t my loaf rise much?
Rye bread is naturally dense, and this dough contains soaked grain and seeds, so it will not expand like a white loaf. A small rise and a slightly aerated surface are expected. A starter that was not active, a cold room, or an overly short proof can reduce the rise further. Give the dough time to show bubbles, but bake it before it looks fragile or begins to sink.

Why is the middle gummy?
The most common causes are underbaking or slicing before the loaf has cooled. Check that the center is set and, if using a thermometer, near 205–208°F (96–98°C). Then cool the loaf for the full 8 hours before cutting. If the center remains gummy after that, your oven may run cool or the loaf may need a little more baking time; next time, check the center and cover the top loosely if it darkens.

Can I leave out the cracked rye or seeds?
You can omit the seeds, though the loaf will have less crunch and a slightly different weight and texture. Do not simply leave out the soaked rye without replacing it: its grains and soaking water are part of the dough’s structure and moisture. Use an equal weight of rye flakes as a practical alternative, or choose another coarse rye product and soak it until softened.

Can I prepare the dough in advance?
The cracked rye can be soaked the night before, which is already built into the schedule. For a longer pause after mixing, refrigerate the covered dough rather than leaving it at room temperature indefinitely; cold fermentation slows activity and changes the timing. Let it warm and continue proofing until it looks slightly puffy, then bake. Because a cold dough may take longer than the listed 2-hour proof, use its appearance as your guide.

How do I know whether my starter is ready to use?
A ripe starter should show bubbles throughout and have risen after a recent feeding. It should smell pleasantly sour or yeasty, not strongly unpleasant. If it has been stored in the refrigerator, feed it and let it become active before mixing this loaf. Starter strength varies, so the dough’s modest rise and bubbles are more reliable than expecting an exact doubling.

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