What the food processor does here (and what it cannot do)
A food processor can puree cooked peppers and onions into a smooth soup because the wide bowl lets the blades pull thick mixtures down and around. It also handles add-ins like bread or nuts well, which can bog down some blenders if the mixture is too thick.
What it cannot do well is safely process a large volume of hot liquid at once. Hot soup releases steam, steam expands, and that pressure can force liquid out through the lid or center opening. The fix is simple: cool the base briefly, work in smaller batches, and never fill the bowl high with hot liquid.
Ingredients and smart swaps (jarred vs roasted peppers, broth, cream-free options)
Jarred roasted red peppers are consistent and fast. If you roast your own, peel and seed them well because skins and seeds are common causes of grainy texture. Either way, draining excess liquid helps you control thickness with broth instead of ending up with a watery soup.
For body without cream, bread makes the soup velvety and mild, while cashews add richness and a slightly fuller mouthfeel. Use vegetable broth for a lighter, sweeter pepper flavor, or chicken broth for a rounder, savory base. If you want it dairy-finished, a spoon of yogurt or sour cream at serving gives creaminess without changing the whole pot.
Step-by-step: build the base, puree in safe batches, then simmer to finish
Cooking the tomato paste briefly is a small step with a big payoff. It removes raw tomato flavor and adds depth, which keeps the soup from tasting like straight blended peppers. Simmering the base before pureeing also softens everything so the processor can get it smoother with less time.
Puree in batches that are comfortably below the top of the bowl. If the mixture just spins and does not move, it is too thick for the blades to circulate, so add broth a tablespoon or two at a time. After pureeing, a short simmer helps the soup thicken slightly and lets you fine-tune salt and acidity without overcooking the pepper flavor.
Texture fixes and storage (too thin, too thick, grainy puree, freezing)
If the soup is too thin, simmer it uncovered for 5 to 10 minutes, stirring often, or process in a little more bread or a small handful of cashews. If it is too thick, thin with warm broth a splash at a time until it pours easily from a ladle.
If the puree is grainy, the usual causes are pepper skins, under-processing, or not enough liquid for circulation. Process longer in smaller batches and add a bit more broth to help the blades pull everything through. The soup freezes well for about 2 months. Thaw in the fridge, reheat gently, and whisk in a splash of broth if it tightens up.