Cut tofu, potatoes, and mushrooms into bite-sized pieces.
Finely chop the onion and garlic.
Heat cooking oil in a pot and sauté garlic and onion.
Add potatoes and mushrooms and stir-fry.
Pour in 400ml of water and bring to a boil.
When the potatoes are cooked, add the tofu.
Season with salt and pepper.
Simmer for another 5 minutes and it's ready.