Heat olive oil in large frypan until shimmering on medium
Add onion and gently saute for 4 - 5 minutes
Add garlic and mustard seeds and saute for another minute
Add zucchini, capsicum and mushrooms and continue to cook for about 3 - 4 minutes until softened
Add tuna and mix through until heated
Turn off heat and add tahini, greek yoghurt and chilli jam to pan. Stir through
Serve on brown rice with spring onions as a garnish