Mash garlic and salt together into paste. Using a wooden spoon, push the blackberries through a non-metallic sieve. Discard seeds. Mix garlic paste and blackberry juice with remaining ingredients and let set to blend flavors. Bake drummies at 375 for 1/2 hour. Brush on blackberry sauce and continue to bake another 1/2 hour, until wings are tender. Baste and turn frequently. Add water if the juice cooks away before wings are done.