Basic Tomato Sauce

There’s this notion that seeds make sauce bitter. I’ve made a lot of sauce using a food mill. The idea is tomatoes pass through, seeds get caught, and you get a seedless sauce that isn’t bitter and has great texture. Food mills are great, but when hand-cranking became a full-time job, we experimented with an immersion blender. Side-by-side there was no bitterness. I think the gelatinous sacs surrounding tomato seeds (which inhibit germination) add more flavor. Either way, if you get