How to Make a No-Cook Lemon Curd in a Kilner® Jar

Quick answer

To make a no-cook lemon curd in a Kilner® jar, whisk together fresh lemon juice, zest, sugar, and butter in a heatproof bowl set over simmering water, then pour into a sterilized jar and refrigerate. This method avoids direct heat on the stove and yields a smooth, tangy curd in about 15 minutes.

Lemon curd is a classic spread that brightens scones, cakes, and toast, but traditional recipes require careful stirring over a double boiler to avoid curdling. If you want a simpler approach, a no-cook version made directly in a Kilner® jar is a game-changer. It uses the gentle heat of a water bath to melt the ingredients without constant whisking, and the jar doubles as your mixing bowl and storage container.

In this guide, you’ll learn how to make a foolproof no-cook lemon curd in a Kilner® jar, including tips for achieving the perfect consistency, storing it safely, and turning it into a thoughtful homemade gift. Whether you’re new to preserving or a seasoned cook, this method is quick, versatile, and requires minimal cleanup.

Why Make Lemon Curd in a Jar?

Making lemon curd in a jar reduces mess and saves time. You don’t need to transfer hot curd from a saucepan to a separate container—simply mix, heat, and store all in one vessel. This is especially handy if you’re preparing small batches or want to give jars as gifts.

Kilner® jars are ideal because they’re made from heat-resistant glass that can withstand the gentle heat of a water bath. The wide mouth makes whisking easy, and the airtight seal keeps your curd fresh for weeks when refrigerated. Plus, the classic design looks beautiful on your kitchen counter or as a gift.

• Use a jar that fits comfortably in a saucepan with a folded cloth at the bottom to prevent direct contact with heat.
• Always start with a clean, sterilized jar to ensure your curd stays safe to eat.

Ingredients and Equipment

For this no-cook lemon curd, you’ll need just four ingredients: fresh lemons (juice and zest), caster sugar, unsalted butter, and eggs. The eggs provide richness and help thicken the curd, while the butter adds a silky texture. Choose unwaxed lemons if possible, as the zest is a key flavor component.

Equipment-wise, you’ll need a Kilner® jar with a clip-top or screw band, a small saucepan, and a whisk. If you have a Kilner® Smoothie Making Set, its jar can double as a mixing bowl, though any Kilner® jar with a wide mouth works well.

• Use fresh lemon juice—bottled juice lacks the bright flavor and may alter the set.
• Have a kitchen thermometer on hand if you want to check the temperature (should reach 170°F/77°C).

Step-by-Step Method

Start by filling a saucepan with a couple of inches of water and bringing it to a gentle simmer. Place a clean cloth or trivet at the bottom to prevent the jar from rattling. In your Kilner® jar, combine the lemon zest, juice, sugar, and eggs, and whisk until smooth.

Set the jar in the water bath, making sure the water level is halfway up the jar. Whisk the mixture occasionally as it heats. After about 10 minutes, add the butter in small pieces and continue whisking until the curd thickens and coats the back of a spoon. This usually takes another 5–7 minutes.

Once thickened, remove the jar from the water bath and let it cool slightly before sealing with the lid. Refrigerate for at least 2 hours to allow the curd to set completely. It will thicken further as it cools.

• Don’t let the water boil too vigorously, or the curd may separate.
• Whisk constantly during the final minutes to prevent lumps.

Storing and Using Your Lemon Curd

Proper storage is key to enjoying your lemon curd safely. Once cooled, seal the jar with its lid and refrigerate. Homemade lemon curd typically keeps for up to two weeks in the fridge when stored in a sterilized, airtight jar. For longer storage, you can freeze it in a freezer-safe container for up to three months.

Your no-cook lemon curd is incredibly versatile. Use it as a filling for tarts, a topping for pancakes, or a swirl in yogurt. It also makes a lovely homemade gift—tie a ribbon around the jar and attach a label with the date and ingredients.

• Always use a clean, dry spoon to scoop out curd to prevent contamination.
• If you notice any mold or off-smell, discard the curd immediately.

Step-by-Step Guide to No-Cook Lemon Curd

1. Step 1: Sterilize your jar: Wash your Kilner® jar and lid in hot, soapy water, then rinse well. Place the jar in a preheated oven at 140°C (275°F) for 10 minutes, or use a sterilizing solution. Let it dry completely. A clean jar prevents bacterial growth and ensures your curd lasts longer.
2. Step 2: Mix the ingredients: In the jar, combine the zest and juice of two lemons, 100g caster sugar, and two large eggs. Whisk until the sugar is dissolved and the mixture is smooth. Make sure there are no lumps of sugar, as they can cause a gritty texture.
3. Step 3: Set up a water bath: Place a folded cloth in the bottom of a saucepan and add water to a depth of about 2 inches. Bring to a gentle simmer. Place the jar in the water, ensuring it doesn’t touch the bottom directly. The cloth prevents the glass from cracking due to direct heat.
4. Step 4: Cook gently: Whisk the mixture occasionally as it warms. After 10 minutes, add 50g unsalted butter, cut into small pieces. Continue whisking until the curd thickens and coats the back of a spoon, about 5–7 more minutes. If the curd starts to curdle, remove from heat immediately and whisk vigorously to smooth it out.
5. Step 5: Cool and store: Remove the jar from the water bath and let it cool to room temperature. Seal with the lid and refrigerate for at least 2 hours before serving. The curd will thicken further as it cools, so don’t worry if it seems thin at first.

Kilner® Products That Make Lemon Curd Easier

• Kilner® Smoothie Making Set: The Kilner® Smoothie Making Set makes it incredibly easy to create homemade smoothies, iced tea, juices or other cold drinks. While designed for drinks, the jar in this set is perfect for mixing and storing lemon curd, thanks to its wide mouth and sturdy glass.
• Fresh Storage 0.75 Litre: Kilner® 0.75 Litre Fresh Storage is a unique stackable food storage container that is made from heat resistant glass and is freezer, oven and microwave safe. If you plan to freeze your lemon curd, this container is an excellent choice because it can go straight from the fridge to the freezer without worry.
• Square Glass Clip Top Jar - 0.5 Litre: Kilner Square 0.5L Clip Top Glass Storage Jar is durable and practical. With an airtight clip top the jar is suitable for preserving jams, chutneys and storing dry food stuffs. This jar’s airtight seal keeps your lemon curd fresh and makes it a beautiful gift option.

Making no-cook lemon curd in a Kilner® jar is a simple, rewarding process that yields a delicious, versatile spread. With just a few ingredients and a little patience, you can enjoy fresh lemon curd anytime. For the best results, use a high-quality jar like the Kilner® Square Glass Clip Top Jar - 0.5 Litre, which is perfect for storage and gifting. Try this recipe today and discover how easy homemade lemon curd can be!