Put all of the strawberries in a pot with 4 cups of water. Bring to a boil. Reduce to a medium simmer and let the strawberries cook for about 20 minutes. Skim any foam that rises to the top. After about 20 minutes, the strawberries will have lost most of their color.
Using oven mitts, remove from the heat. Strain the strawberry liquid through a fine-mesh strainer into a clean pot. Make sure no...