
Bright, silky, and intensely lemony, this curd is the kind of thing you'll want to spoon straight from the jar. Managing a nickel sensitivity can make store-bought curds and spreads a minefield, since many commercial versions contain high-nickel ingredients like nuts, seeds, or whole-grain additives — but this recipe keeps things beautifully simple. Eggs, sugar, fresh lemon juice, lemon zest, butter, and a pinch of salt are all you need, and none of them are high-nickel offenders. The double-boiler method is the real secret here: gentle, indirect heat lets the eggs thicken the curd gradually without scrambling, giving you that glossy, spoonable texture every time. Whisking in cold butter cubes at the end adds richness and a gorgeous sheen that makes this feel far more impressive than the effort involved. Straining the finished curd through a fine-mesh sieve leaves you with something impossibly smooth — perfect on toast, stirred into yogurt, or layered into a simple tart. Once you've made it yourself, it's hard to go back to anything from a shelf.
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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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