
Bright, tangy, and impossibly silky, this lime curd is the kind of thing you'll want to spoon straight from the jar. Every bit of flavor here comes from real limes — the zest and the juice — along with eggs, butter, sugar, and salt. There's nothing synthetic hiding in the mix, which is more than you can say for many store-bought curds that rely on artificial flavoring to mimic that sharp citrus punch. The double-citrus approach of using both zest and fresh juice gives you a depth and brightness that no shortcut ingredient could replicate. Cooking the mixture low and slow over a double boiler and whisking in cold butter cubes at the end creates that glossy, luscious texture that sets up beautifully in the fridge. Straining the finished curd through a fine-mesh sieve gives it a perfectly smooth, professional finish. Spread it on toast, swirl it into yogurt, or use it as a tart filling — however you serve it, the flavor is 100% the real deal.
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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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