slice an X into the bottom of your tomatoes & place your tomatoes in boiling water for 1 minute.
remove tomatoes from water and the skin should effortlessly peel off.
cut the tomato into sections and remove seeds using a metal strainer over a bowl or large measuring cup. Then saute your tomatoes with onions and garlic until the tomatoes become sauce. Add your tomato paste and taste to season. If you want a smooth sauce, just add them to a blender after sauteing.