Black Garlic Caesar Salad

Name: Black Garlic Caesar Salad
Ingredients: 3 oz. black garlic, peeled (about 6 cloves); ⅓ cup fresh lemon juice; 1 2-oz. tin oil-packed anchovy fillets, drained, coarsely chopped; 2 Tbsp. Dijon mustard; ½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt; 1 oz. Parmesan, finely grated (about ½ cup), plus more for serving; Freshly ground pepper; ⅔ cup extra-virgin olive oil; 4 heads of romaine lettuce, leaves separated, largest leaves halved crosswise; Shiso leaves (for serving; optional)