Step 4: Extracting the Pulp
You can also use the "crush and cook" method to prepare tomatoes for a tomato mill. Cut up a few tomatoes to start and put them into a pan over medium-high heat. Crush them with a masher and continue to add tomatoes (small ones can be incorporated whole; you'll probably want to cut up large ones unless you are tall with good arm strength) as the first ones juice and soften.
Spoon the cooked tomatoes into the mill's hopper. Have the bowl in place to catch the pulp and something in place to catch the debris. I found that a silicon bread pan works great for this: it fits under the debris spout nicely, has a good capacity, and is easy to empty into the hopper for a second run and into the compost bin when you're done. With my mill, there is still some pulp in the debris after the first run. I put it back into the hopper and usually get another half cup of pulp from the full hopper load.
I periodically empty the pulp collected to the pot in which I cook the sauce.