The primary ingredient in mushroom risotto is Arborio rice. This short-grain rice is known for its high starch content, which gives risotto its creamy texture when cooked. Arborio rice absorbs liquids well and cooks to a perfect al dente consistency, making it ideal for this Italian dish. When combined with sautéed mushrooms, broth, and often onions and Parmesan cheese, it creates a hearty and flavorful meal. The risotto is typically stirred frequently during cooking to release its starches, contributing to the dish's signature creaminess and rich flavor.