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How to make lemon sauce
Combine all ingredients in a transparent microwave-safe bowl.
Preferably it'll have a matching lid if you mean to save any for later. If it doesn't, you'll need to cover the top with a paper towel to keep the liquid from getting all over the place.
Stir until the cornstarch is evenly dispersed, forming a cloudy mixture. The sugar and butter will not dissolve immediately.