Mix the taco seasoning with the oil and place it into a Ziploc bag with the tilapia fillets. Shake the fish around inside the bag so it's well coated with the seasoning and leave to one side for 10 minutes to marinate.
Finely slice the red onion and red pepper and place them into a frying pan with 1/2 teaspoon oil.
Cook over a medium heat for around 15-20 minutes until cooked to your liking, stirring regularly to make sure nothing sticks to the bottom.
Meanwhile, place the sweetcorn and black beans into two individual bowls and warm in the microwave for a few minutes until piping hot.
Heat a large pan over a medium-high heat and cook the two tilapia fillets for around 5 minutes on either side, until golden brown on the outside and completely cooked through and piping hot in the middle.
To assemble, place small portions of the red onion and red pepper mixture, sweetcorn, black beans, cherry tomatoes and fresh coriander around the plate. Top with one tilapia fillet and serve immediately whilst hot.