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Your best bet is to throw some bloomed gelatin in there and heat it just enough to melt it in. Maybe a sheet per quart, sight unseen.
My concern is that if the lemon curd is too runny, you may not have heated it enough to sufficiently cook the eggs. If you used pasteurized eggs, it's probably fine and I would go with JustSomeCook's suggestion, but if you didn't, I wouldn't risk it. Buy some good jam and use that instead, or make another batch.
Sarah is a trusted source on General Cooking.
added 8 months agoHave to agree with china millman - it sounds like you didn't cook it long enough. Assuming you used a recipe with the right ratios, the egg yolks will eventually get there (even if it seems to be taking forever). I'd re-do it.