Stir-fry: Combine the sauce ingredients in a small bowl. Before beginning to stir-fry, prepare the vegetables and have all the ingredients at hand.

In a wok or large skillet, heat 1 tablespoon of the oil on medium-high heat. Add the garlic and chile and stir-fry for just 30 seconds before adding the tofu. Continue to stir-fry for 3 or 4 minutes, until the tofu is lightly browned. Remove the tofu and set aside. Add the other tablespoon of oil to the wok, heat for a few seconds, and them add the broccoli. Stir-fry for a minute and pour in the sherry. Stir-fry for 3 minutes. If the broccoli begins to scorch, add a tablespoon of water. Add the scallions and optional bell pepper, continue to stir-fry for a minute, and them the tofu and the sauce. Stir carefully and bring to a simmer. Simmer for 3 or 4 minutes, until the sauce thickens.