Preheat the oven to 180C. Toss your red peppers with olive oil and roast in the oven on a baking tray for 20 minutes until softened.
To make the dressing, add the capers, olive oil, garlic, mustard and basil leaves to a bowl and mix well to combine. Add in the lemon juice and a little more oil if necessary and set aside.
Heat a non-stick frying pan over a medium heat and cook the halloumi slices for 1-2 minutes on each side until golden. (If you don’t have a non stick add in a little oil)
Serve the halloumi with the roasted peppers, drizzle over the dressing and sprinkle on a few fresh basil leaves.