1
In a large pot, combine crushed tomatoes and 5 cups water (10 cups for 4 servings); season with ½ tsp sugar (1 tsp for 4 servings), salt, and pepper. Cover and bring to a boil, then reduce to a low simmer.
Meanwhile, wash and dry produce.
Dice tomato into ½-inch pieces. Halve, peel, and finely dice onion. Roughly chop parsley.