Cut the enoki mushrooms and tofu into bite-sized pieces.
Slice the onion and green onion and set aside.
Heat some cooking oil in a pan and sauté the onion and green onion.
Add the enoki mushrooms and stir-fry.
Add the tofu and gently mix and stir-fry.
Season with soy sauce, minced garlic, and pepper.
Serve the stir-fried enoki mushrooms and tofu over rice.