Branzino BLT

Name: Branzino BLT
Ingredients: 1/2 pound cold bacon, ground in a food processor until very finely diced; 1/2 pound heirloom tomato, cut into wedges; 4 cloves garlic; 1 bunch fresh basil; 1/2 cup red wine vinegar; 2 tablespoons olive oil; 2 whole branzino, gutted (1 to 2 pounds each after gutting); Kosher salt and freshly ground black pepper; 2 lemons; 4 heads baby romaine lettuce, sliced in half; 125 grams quick-cooking polenta; 1/2 cup mascarpone; Pinch kosher salt; 2 tablespoons unsalted butter; 1 banana, small dice; 2 tablespoon freshly grated Parmesan