- For tart shells:
- 1/2 cup pecans, lightly toasted
- 1/2 cup packed light brown sugar
- 2 cups all-purpose flour
- 1 cup cold unsalted butter, cut into tablespoons
- 1 teaspoon ground cinnamon
- 1 teaspoon ground ginger
- 3/4 teaspoon salt
- For grape filling:
- 2 cups Ruby Port
- 1 1/2 cups Concord grape jelly
- 3/4 teaspoon fresh lemon juice, or to taste
- 5 pounds red seedless grapes, stems discarded
- Special equipment: 2 (11 1/4- by 8- by 1-inch) rectangular tart pans with removable bottoms, or 2 (10-inch) round fluted tart pans with removable bottoms
- Make tart shells: Preheat oven to 350 degrees F.
- Pulse pecans with brown sugar in a food processor until finely ground (do not allow to become a paste). Add flour, butter, cinnamon, ginger, and salt and pulse until mixture begins to form large lumps. Divide mixture between tart pans and press evenly over bottom and up sides with floured fingers. Chill until firm, about 30 minutes.
- Bake tart shells in lower third of oven until golden brown, about 25 minutes. Transfer shells in pans to racks to cool completely. Carefully remove sides of pans, keeping shells on pan base.
- Make filling while shells cool: Simmer Port and jelly, stirring occasionally, until reduced to about 1 1/2 cups, about 30 minutes, then stir in lemon juice. Immediately toss grapes with 1 cup glaze in a large bowl until well coated, then mound in tart shells.
- Just before serving, drizzle tarts with more glaze and serve remainder on the side.