Try this One Pot Pasta recipe, or contribute your own.
Crushed tomatoes drive the chemical environment of this dish, providing both the free water necessary to hydrate the starch and the acidic pH that slows gelatinization. Starch molecules swell and absorb liquid proportionally to the surrounding volume under pressure. When scaling this recipe up or down, the ratio of dry pasta to cooking liquid must remain strictly one-to-one by weight or volume. Pressure cookers require a minimum amount of free liquid to generate steam, typically one cup of thin liquid for small units and two cups for six-quart models. Exceeding the maximum fill line of the inner pot by more than two-thirds risks blocking the pressure release valve with expanding starch foam.
Overcooking remains the single greatest pitfall when pressure cooking starches, turning the noodles to mush within seconds. Adjust the sugar at the very end of cooking to balance tomato acidity without scorching the bottom of the vessel during the pressure cycle.