Fruit curds may be made using a double boiler. A double boiler is the set up where a small amount of water is brought to a simmer in a saucepot. A second pot is placed on top and all the ingredients are cooked in that second pot, above the simmering water. This is a very gentle cooking method and is great for curds because the eggs are less likely to overheat or cook such that they scramble. It is not necessary though to use a double boiler. I used a single saucepan for this recipe and had great success.