
Bright, tangy, and impossibly silky, this lime curd is the kind of thing you'll want to spoon straight from the jar. It gets its luscious texture entirely from real butter and eggs — no vegetable oils, no canola, no mystery fats hiding in the mix. That matters more than you might think, because most store-bought curds and even some homemade recipes sneak in refined oils to cut costs or extend shelf life. Here, the richness comes purely from good unsalted butter whisked in cube by cube, which gives the curd that glossy, melt-on-your-tongue finish you just can't fake. The double-boiler method keeps the heat gentle so the eggs cook slowly and evenly, resulting in a smooth, custardy consistency rather than anything scrambled or grainy. Straining it at the end guarantees a perfectly clean, velvety texture every time. Spread it on scones, swirl it into yogurt, or use it as a tart filling — however you use it, you'll know exactly what went into every spoonful.
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Whisk together the lime zest, lime juice, sugar, whole eggs, egg yolks, and salt in a heatproof bowl until the sugar is mostly dissolved and the mixture is smooth.
Set the bowl over a medium saucepan of barely simmering water, making sure the bottom of the bowl does not touch the water. Cook, whisking constantly, until the curd thickens enough to coat the back of a spoon and a finger drawn through leaves a clean line, and the mixture reaches 170°F (77°C) on an instant-read thermometer, about 10–12 minutes. Reaching 170°F (77°C) ensures the eggs are fully cooked and the curd is food-safe.
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