PREHEAT your oven to 200°C fan forced
COMBINE drained tuna, yoghurt, mayo, capers, spring onions, celery, basil, parmesan into a bowl.
STUFF the filling into the capsicum halves.
TOP with a slice of Mozzarella.
BAKE for 15 mins - in the last 2 minutes. turn on the grill setting to make them golden on top.
SERVE hot or warm, arranged over a bed of rocket leaves.
DRIZZLE with sticky balsamic before serving.
ENJOY.