In a large skillet or wok, heat 1 tablespoon oil until it is hot over medium-high heat.
Add in the onion, garlic, and ginger; stir frequently for 2-3 minutes; remove from skillet Heat the other 1 tablespoon oil in the skillet until it is hot.
Add fish cubes, broccoli, mushrooms, and red bell pepper to the skillet; stir constantly 3-4 minutes or until fish flakes easily.
Add onion mixture back to the skillet; stir to combine.
In a measuring cup or small bowl, whisk the cornstarch, water, wine, soy sauce, and hot sauce.
Pour mixture into the skillet; stir for 1 minute or until thickened.