Dice tofu into 1cm (1/2in) cubes. Place in a bowl with a lid. Sprinkle with Tajin seasoning then pop on the lid and shake to coat the tofu in the seasoning.
Dice or slice cumber into bite sized pieces and place in a bowl.
Top with the seasoned tofu.
Drizzle over sour cream. Serve with extra Tajin if you want more flavour.