Where the Wild Things Grow

My research into how peasants and habitants supplement their diets by foraging made me want to try it myself.  Right in my backyard—in the wild marshy area—I discovered blackberries. I picked as many ripe berries as I could reach without getting trapped in brambles.  I have the scratches to prove it and will don long pants for tomorrow’s picking.  Other than muffins, what can I make with blackberries?? Recipes anyone?