Broccoli and beef are a classic pairing that doesn't really need a side dish. However, if you do want to add a side dish to serve with them but to keep carbs minimal then it can be a challenge. However, there are a few low-carb rice substitutes that you can use in place of traditional white rice. Some of the most popular substitutes include cauliflower rice, mushroom rice, lentils, and Shirataki rice. These substitutes are easy to prepare and can be used as keto-friendly side dishes for beef and broccoli.