Dice tofu into 1cm (1/2in) cubes. And dice onion.

Heat a frying pan on a medium high heat. Add a splash of oil and then cook the onion, stirring every minute or so until the onion is no longer crunchy.

Add the diced tofu and keep cooking for a minute or until the tofu is hot. It's not going to brown and that's OK.

Remove from the heat. Stir in the soy sauce and tip the hot tofu onto a plate or bowl.

Drizzle over the peanut butter. Slice cucumber and place on the side. If using frozen green beans quickly rinse the pan and, return the pan to the heat on medium high add the beans. Cover and cook for a minute. Stir and cover and cook again, repeating until the beans are hot. Place beans on the plate.

Serve with hot sauce on top (if using).