~~Raspberry Rhubarb Jell-O Jam~~  6 cups fresh rhubarb, stalks cut lengthwise in half and then crosswise into 1/4- to 1/2-inch dice  4 cups granulated sugar  Freshly grated zest and juice from one medium lemon  2 cups raspberries  One (3-ounce) package raspberry-flavored Jell-O
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