Preheat your oven to 475 degrees.
Mash about ¾ of the blackberries in a mixing bowl. (Hint: If you have a drink muddler handy, that will do the trick! Otherwise, you can use any utensil.) Slice the remaining ¼ of blackberries in half and set aside.
Thinly slice the jalapeno and basil leaves.
On a lightly-floured work surface, roll out your pizza dough or shape it by hand. (If you don't have a rolling pin, try a wine bottle.)
Place pizza dough on a lightly oiled baking sheet. Rub olive oil onto dough.
Spread mashed blackberries over the crust as sauce. Top with shredded mozzarella and freshly grated parmesan cheese. Sprinkle dallops of ricotta cheese across the pizza. Scatter jalapeño slices on top.
Bake for 10 minutes.
Remove from oven and add basil slices. Return to the oven for 2 more minutes.
Remove from oven. Tear the prosciutto and place pieces on hot pizza. Slice pizza and enjoy.
