Heat oven to 180C/160C fan/gas 4. Chop the pineapple into chunks and put in a roasting tin. Bake for 35-40 mins until golden, then cover and set aside.
Chop the mint leaves and mix with the sesame seeds in a dish. Set aside. Cut the halloumi into cubes and char on all sides in a hot non-stick frying pan. Toss the pineapple in the sesame mixture, then thread onto cocktail sticks with a piece of halloumi.