Heat oven to 350° F. Fit 1 piecrust into a 9-inch tart pan with a removable bottom (save the other crust for future use). Place the almonds, cookies, and sugar in a blender or food processor and pulse to a fine sand; sprinkle on the bottom of the crust. Halve and pit the apricots. Arrange them, cut-side down, on top of the crumbs. Bake for 25 minutes or until the crust is golden brown. Remove from oven and cool on a wire rack. Put the jelly into a small saucepan and warm over medium heat until melted and bubbling, stirring constantly. Spoon over the tart. Set aside to cool completely. Garnish with blueberries or blackberries and serve.