Lemon curd is a tricky little monster. It’s made with eggs, butter, sugar, and lemon juice—basically a chemistry lab of stuff that can spoil. The sugar and acid act like bodyguards, but they’re not invincible.
If you leave it out on the counter for a day (hey, no judgment), the eggs throw a party and invite bacteria. Room temperature is a death sentence for unsealed lemon curd. Refrigeration buys you time, but not forever.
Think of it like this: the sugar is the hero, the acid is the sidekick, but time is the villain. And villains always win eventually.
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Your senses are your best friends here. Trust your nose, your eyes, and your gut. If your lemon curd smells like sour yogurt or… something funky, toss it. That’s not “artisanal complexity,” that’s spoilage.
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Look for mold—usually green or white fuzzy spots. But here’s the kicker: mold can grow under the surface. You might see a smooth top, but a dark, watery layer underneath? That’s a bad sign, my friend.
Another clue: weeping. If your curd has separated into a watery, sad mess with crystals on top (like a bad breakup), it’s past its prime. It might not kill you, but it’ll taste like regret.
