To use a double boiler, add water to the lower pan, set it over medium-low heat so that the water just simmers, and place the upper pan on top. Add the ingredients needing gentle heat to the top pan, stirring constantly until melted or blended. Remove both pans from heat.
- Add water to the lower pan
Add 1 to 2 inches of water to the lower pan. Make sure that the water doesn't touch the bottom part of the upper pan when the upper saucepan nestles into it.
- Place the lower pan over medium-low heat
Place the lower pan on the stove burner over medium-low heat. Allow the water to come to a gentle simmer. You want the bubbles to just barely break the surface of the water.
- Add the ingredients requiring gentle heat to the top saucepan
Add the ingredients into the upper part of the double boiler set. This is usually a smaller, shallower, saucepan. Place on top of the larger saucepan containing the simmering water.
- Stir the ingredients constantly, making sure the bottom pan doesn't boil dry
Stir the ingredients constantly until melted or blended. Simmering water evaporates quickly. Do not let the larger pan boil dry. Add more water as needed. Once the ingredients have melted or blended, remove the double boiler from heat and discard any remaining water.