Pulse chopped cauliflower in a food processor until the consistency is similar to rice. You can also grate the cauliflower on a box grater. Set aside.
Heat 1 tablespoon of sesame oil in a pan on medium high heat. Add crumbled tofu and 2 tablespoons of tamari. Cook until starting to brown, about 5-10 minutes.
Add riced cauliflower, peas, carrots, garlic, ginger, hoisin sauce, the rest of tamari and sesame oil, and salt and pepper. Cook until vegetables are tender.
Add chopped green onion and cook about a minute longer.