Bright, tangy, and impossibly silky, this lemon curd is the kind of thing you'll want to spoon straight from the jar. Traditional curd recipes rely on egg yolks for thickening, but this version uses cornstarch instead — a smart swap that keeps the ingredient list short and avoids the higher-nickel proteins found in egg-heavy preparations. Fresh lemon juice and zest do all the heavy lifting on flavor, giving you that sharp, sunny punch balanced by butter and sugar. The technique is straightforward: constant whisking over medium heat coaxes the mixture from cloudy to glossy and translucent, and finishing with cold butter pieces one at a time gives it that luxurious, smooth body. Straining the finished curd through a fine-mesh sieve ensures a perfectly clean texture with no stray zest solids. It sets up beautifully in the fridge and works as a tart filling, a toast spread, or a swirl through yogurt — endlessly versatile and genuinely hard to stop eating.
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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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