Mixed Citrus Marmalade - cooking recipe

Ingredients

2 large oranges (thin-skinned)
2 medium red grapefruits (about 2 pounds)
1 lemon
2 cups sugar
2 cups water
1/8 teaspoon kosher salt

Preparation

Carefully remove rind from fruit using a vegetable peeler, discard white pith. Cut rind from 1 orange, 1 grapefruit and lemon into 1 1/4 inch strips. Section fruit, cut into 1 inch pieces. Discard seeds, reserve juice.
Combine all ingredients in a large saucepan; bring to a boil. Reduce heat, and simmer 1 hour or until thick, stirring occasionally. Cool. Pour into airtight containers. NOTE: Store marmalade in the refrigerator up to three weeks.