Rhubarb Jam Bars Recipe | Valerie Bertinelli | Food Network

Ingredients

• 1 pound rhubarb, trimmed and sliced
• 2 teaspoons cornstarch
• 3/4 cup sugar
• 1/2 cup water
• 1 stick plus 2 tablespoons cold unsalted butter, cut into 1/2-inch pieces, plus more for the pan
• 1 3/4 cups all-purpose flour
• 1/2 cup sugar
• 1 teaspoon kosher salt
• 6 tablespoons ice-cold water
• 1/2 cup rolled oats
• 1/4 teaspoon ground allspice
• 1/4 teaspoon ground cinnamon