Boil noodles according to directions on package, add 1 tablespoon of oil to the water. Drain and cover with cold water, set aside.
Combine cottage cheese, cream cheese, onion, egg, basil, salt, and pepper, set aside.
Line the bottom of greased 9 x 13-inch casserole dish with a layer of cooked noodles and half of the cream cheese mixture. Add another layer of noodles and all of the crab and shrimp sauce. Cover with another layer of noodles and the rest of the cream cheese mixture. Arrange sliced tomatoes in a single layer on the top. Sprinkle with sugar. Cover and refrigerate overnight.
The next day, preheat oven to 350 degrees. Sprinkle grated cheddar cheese over the top and bake for 1 hour. Let stand 10 minutes before serving.