Lemon fudge is a soft, creamy confection made with white chocolate, sweetened condensed milk, and fresh lemon zest. It sets in the refrigerator rather than needing a candy thermometer, and the zest gives each square a bright citrus flavor without adding the extra moisture of lemon juice.
Ingredients
- 3 cups (510 g) white chocolate chips — or finely chopped white chocolate bars. Choose real white chocolate made with cocoa butter for the smoothest melt; some baking chips stay firmer.
- 1 can (14 oz / 396 g) sweetened condensed milk — use sweetened condensed milk, not evaporated milk. The sugar and milk solids help the fudge set.
- 2 tablespoons (28 g) unsalted butter — cut into small pieces so it melts evenly into the chocolate mixture.
- 2 tablespoons (about 12 g) finely grated lemon zest — usually the zest of 2 to 3 lemons. Grate only the yellow skin, avoiding the bitter white pith.
- ½ teaspoon (2.5 ml) lemon extract — use a pure extract if available. This gives a clear lemon flavor that holds up against the sweetness of the chocolate.
- ⅛ teaspoon (0.7 g) fine salt — optional, but it balances the sweetness and makes the citrus taste more pronounced.
- Yellow gel food coloring, optional — a small dab adds color without thinning the mixture.
Instructions
- Prepare the pan and lemon. Line a 9-inch (23 cm) square pan with parchment paper, leaving enough overhang on two sides to lift the fudge out later. Zest the lemons finely, then measure the zest. Set out the condensed milk, butter, and other ingredients before heating the chocolate; once melted, the mixture is easiest to handle promptly.
- Combine the chocolate, condensed milk, and butter. Put the white chocolate chips, condensed milk, and butter in a heavy-based saucepan. Heat over low, stirring constantly with a flexible spatula and scraping along the bottom and corners. Keep the heat gentle: white chocolate can scorch or turn grainy if it gets too hot.
- Melt until smooth. Continue stirring for about 5 to 8 minutes, adjusting the heat as needed. The mixture is ready when no chocolate pieces remain and it looks glossy and thick. If a few pieces are stubborn, take the pan off the heat and keep stirring; the residual warmth often melts them without further heating. Do not let the mixture boil.
- Add the lemon flavor. Remove the pan from the heat. Stir in the lemon zest, lemon extract, and salt until evenly distributed. If using gel coloring, add just a tiny amount and mix thoroughly before deciding whether to add more. Keep the mixture thick; adding lemon juice or liquid coloring can make the finished fudge softer and less reliable to slice.
- Fill and smooth the pan. Scrape the fudge into the lined pan. Spread it into an even layer, pressing it gently into the corners with the spatula. Smooth the top without repeatedly working the mixture, which can make it lose its glossy finish. Tap the pan lightly on the counter once or twice to settle any large air pockets.
- Chill until firm. Refrigerate the pan, uncovered or loosely covered, for 3 hours, or until the center feels firm when lightly pressed. Once set, use the parchment overhang to lift the slab onto a cutting board. Let it stand for 5 to 10 minutes if it is very cold, then cut into 36 squares with a large, sharp knife. Wipe the blade between cuts for neat edges.
Tips
- Keep water away from the chocolate. A little water or steam can make melted chocolate seize into a stiff, lumpy mass. Make sure the saucepan and spatula are dry, and avoid covering the pan while it is heating, since condensation can drip back into the mixture.
- Use zest for fresh lemon character. Lemon zest contributes fragrant oils without adding much moisture. A microplane makes fine zest that spreads evenly through the fudge. If you only have a box grater, use its smallest holes and chop any long strands before mixing them in.
- Be cautious with substitutions. Evaporated milk is not a substitute for sweetened condensed milk because it lacks the concentrated sugar needed for this set. Regular chocolate chips may be used for a different flavor, but they will cover the lemon more strongly. If using a white chocolate bar, weigh it rather than estimating by volume.
- Make clean cuts with a warm, dry knife. If the slab is firm, run a sharp knife under hot water, dry it completely, and slice straight down. Rewarm and wipe the blade as needed. A wet knife can leave sticky streaks, so drying it matters as much as heating it.
Serving Suggestions
Serve the squares slightly cool or let them sit at room temperature for about 10 to 15 minutes for a softer bite. They are rich, so cutting the slab into 36 small squares makes a handy portion for a dessert tray, afternoon tea, or a sweet finish after dinner. Arrange them in paper candy cups if you want to keep the pieces from touching on a platter.
The clean lemon flavor pairs well with fresh berries, especially raspberries, blueberries, or sliced strawberries. For a dessert plate, add a few berries and a plain shortbread cookie rather than another very sweet treat. The squares also travel well for a picnic or potluck if kept cool in a covered container; avoid leaving them in a warm car or direct sun, where the chocolate can soften.
Variations
Extra lemony: Increase the finely grated zest to 3 tablespoons (about 18 g), keeping the extract at ½ teaspoon. Adding more zest is a better way to intensify the citrus than adding a large splash of juice, which brings extra water into the mixture and can interfere with the set.
Lemon and berry: Press a small amount of finely crushed freeze-dried raspberries into the top just after spreading the fudge in the pan. Use a light hand so the pieces adhere without making a thick, crumbly layer. Freeze-dried berries add a tart note and a little color; fresh berries are too moist to mix into this fudge.
Vanilla-lemon: Add ½ teaspoon (2.5 ml) vanilla extract along with the lemon extract for a rounder flavor. If you prefer a less sweet finish, use a pinch more salt rather than reducing the condensed milk, since changing that key ingredient can keep the fudge from setting properly.
Swirled top: Before filling the pan, reserve about 2 tablespoons of the melted mixture. Tint the reserved portion with a tiny dab of yellow gel coloring, then drizzle it over the smoothed fudge and draw a toothpick through the lines once or twice. Too much stirring will blur the pattern, so keep the swirls simple.
Storage and Reheating
Because this recipe contains dairy, refrigerate the fudge within 2 hours of making it or serving it. Once firm, store it in an airtight container in the refrigerator for up to 1 to 2 weeks. Place parchment between layers to prevent sticking, and keep the container away from strongly scented foods so the fudge does not pick up other odors.
For longer storage, freeze the cut squares in a freezer-safe airtight container for up to 2 months, with parchment between layers. Thaw them in the refrigerator while still covered, then bring the portions you plan to serve to room temperature for 10 to 15 minutes. Keeping them covered while thawing helps limit condensation on the surface.
Fudge does not need reheating. If it seems too firm straight from the refrigerator, let it stand at room temperature briefly instead of microwaving it; direct heat can melt the chocolate unevenly and leave the squares greasy or misshapen. Return uneaten portions to the refrigerator within 2 hours.
Frequently Asked Questions
Can I use fresh lemon juice instead of lemon extract?
A small amount of juice may add tang, but it also adds water, which can make a condensed-milk fudge softer or less predictable. For a dependable set, use the zest and extract as written. If you want a sharper flavor, add more zest rather than pouring in extra juice.
Can I make lemon fudge in the microwave?
Yes. Combine the chocolate, condensed milk, and butter in a large microwave-safe bowl. Heat in 20-second bursts at medium power, stirring thoroughly after each burst, until smooth; the number of bursts depends on the microwave and bowl. Stop as soon as the chocolate melts, then add the zest, extract, and salt and follow the chilling instructions.
Why is my fudge soft or not setting?
It may need more chilling time, especially if the pan is deep or the refrigerator is crowded. If it remains soft after several hours, possible causes include using evaporated milk instead of condensed milk, adding lemon juice or other liquid, or using a type of chocolate that does not set firmly. Chill it overnight before cutting; if still too soft, serve it cold in small portions.
Can I use white chocolate bars instead of chips?
Yes. Chop the bars into small, even pieces and measure 510 g (about 3 cups loosely filled) so the chocolate-to-condensed-milk ratio stays the same. Real white chocolate bars often melt smoothly, while some chips contain stabilizers and may need a little extra stirring. Avoid using white candy melts unless you specifically want their different flavor and texture.
How do I keep the fudge from tasting too sweet?
White chocolate and condensed milk make this a sweet confection, so the salt and lemon zest are important for balance. Use fresh, fragrant lemons and measure the zest carefully. Serve small squares with tart berries or plain tea, and avoid adding sweet toppings such as frosting or a sugary glaze.
Can I make it ahead for a party?
Yes. Make it up to a week ahead and keep it covered in the refrigerator, or freeze the cut squares for up to 2 months. If freezing, thaw the container in the refrigerator before serving. Cut the fudge shortly before arranging it on a platter for the tidiest edges, and keep it cool until it is time to serve.
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