I made this sauce with three pounds of our large supply of tomatoes. I blanched and peeled the tomatoes but did not de-seed them. Here is my process –
Blanch, peel, and chop tomatoes
Saute 1/2 onion, 1/2 tsp. pepper flakes, and 2 cloves garlic in some olive oil
Add tomatoes and two large basil leaves
Use potato masher to crush tomatoes while simmering for half an hour
salt and pepper to taste
cook pasta
Remove spent basil leaves and garnish dish with fresh basil