
Bright, silky, and intensely lemony, this homemade curd is the kind of thing you'll want to spread on absolutely everything — toast, scones, tart shells, or a spoon straight from the jar. It comes together with just six clean ingredients: eggs, sugar, fresh lemon juice and zest, butter, and a pinch of salt. No emulsifiers, no condiment-style additives, and absolutely nothing that could sneak in an allergen — making it a genuinely worry-free treat for anyone navigating mustard sensitivities. The double-boiler method is the secret to getting that glossy, smooth texture without scrambling the eggs, and whisking constantly through those 10–12 minutes pays off in a curd that's perfectly thick and custardy. Straining it at the end gives you that ultra-smooth, restaurant-quality finish. Once it's chilled and set, you'll have a jar of sunshine-yellow curd that tastes far more impressive than the effort it took to make.
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Fill a small saucepan with about 1 inch of water and bring to a gentle simmer over medium heat. Set a heatproof bowl over the saucepan, making sure the bottom of the bowl does not touch the water.
Whisk the eggs, sugar, lemon juice, lemon zest, and salt together in the heatproof bowl until the sugar is dissolved and the mixture is smooth.
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