
Bright, tangy, and silky smooth, this lemon curd hits every note you want — sharp citrus up front, a buttery richness that lingers, and a glossy texture that looks almost too pretty to spread. Most store-bought curds and even some homemade recipes sneak in vegetable or canola oil as a shortcut emulsifier, which is exactly what you're trying to avoid. This version keeps things clean by relying on real unsalted butter and cornstarch to build that luscious, spoonable consistency — no industrial oils anywhere in sight. The cornstarch does the heavy lifting as a thickener, creating a curd that sets up beautifully firm and sliceable once chilled, without any of the usual egg-yolk-only fussiness. Whisking the butter in piece by piece off the heat is the move that gives it that glossy, velvety finish you'd expect from a high-end patisserie. Strain it through a fine-mesh sieve, press on the plastic wrap, and let the fridge do the rest — you'll have a jar of sunshine-yellow curd ready to dollop on scones, swirl into yogurt, or spoon directly from the jar when no one is watching.
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Whisk together the sugar, cornstarch, and salt in a small saucepan until evenly combined. Add the water and lemon juice and whisk until the cornstarch is fully dissolved with no lumps visible.
Set the saucepan over medium heat and cook, whisking constantly, until the mixture thickens and turns from cloudy to translucent, about 6–8 minutes. Once it begins to bubble, continue whisking for 1 full minute — the curd should be thick enough to coat the back of a spoon and hold a clear line when a finger is drawn through.
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