4-6 servings Ingredients For the Cavatelli 1 pound all-purpose flour, or Italian OO flour 1 pound whole-milk ricotta, drained/hung in cheesecloth overnight 4 ounces semolina 3 ounces Parmigiano Reggiano cheese, freshly grated Water, just enough to make a firm dough For the Sauce 10½ ounces baby arugula, long stem ends removed 8 ripe plum tomatoes,…