1. In a 3-quart saucepan, heat oil over medium heat. Add onion and cook, stirring occasionally, until well browned, about 10 minutes.
2. Stir in peas, greens, tofu, water, hot sauce, salt and pepper; bring to a boil over high heat. Reduce heat to low, cover and cook until greens and peas are tender, about 25 minutes. Adjust seasoning with salt, pepper and hot sauce, if desired. Serve immediately.