I need a substitute for crushed tomatoes!
Cut a small cross in the ends of your whole tomatoes, dunk them in boiling water for 30 to 40 seconds and remove them. With a paring knife, grasp the edge of the skin where you cut a cross and peel the skin off.

In a large bowl, grasp the tomatoes and crush them with your hands until the size you require is achieved. You now have crushed tomatoes.