Combine all the sauce ingredients. Add a tablespoon or two of water to lighten it if it seems too thick.
Heat the sesame oil in a skillet or wok over high heat until it almost smokes. Add the shrimp and cook until pink. Add all the other ingredients, tossing constantly, until the tofu begins to get firm. Add the sauce and cook, tossing the pan contents constantly, until the sauce coats everything and the pan is steaming.
Remove the pan from the heat and add the peanuts, sprouts, and carrots, tossing very lightly. Serve in a broad-rimmed bowl with more Sriracha squirted along the rim and green onions, cilantro, and crushed red pepper for those who like this really hot.