To start, cut the tomatoes into bite sized pieces, about 1/2 inch cubes and set aside. Bring a large pot of water to a boil and cook the orzo according to the directions on the box. Once cooked, drain the pasta and place into a large bowl. Add the tomatoes, salt, olive oil, vinegar and pepper and gently mix the ingredients together. Add most of the basil and combine and garnish the top with the remaining basil.