Bring 1 1/2 pounds seedless green grapes, 3/4 cup sugar, 4 wide strips orange zest, 1/4 cup raisins, 2 tablespoons lemon juice and 1/4 teaspoon kosher salt to a boil in a saucepan over medium heat. Cook, stirring constantly and mashing the grapes against the side of the pan with a wooden spoon, until the mixture coats the spoon, 20 to 25 minutes. Stir in 1/4 cup chopped walnuts. Fill sterilized jars, leaving a 1/2-inch headspace, then seal and process for 15 minutes.
TIP: This conserve ripens as it sits and becomes even more delicious!
Photograph by Kang Kim