1.Preheat the barbecue on high for 30 minutes, then reduce heat to medium.
2.Put the chopped tomatoes in a bowl with the red onion, garlic, basil, mint, spring onions, capers and lemon zest then season. Add half the flour and mix in well. Leave for 5 minutes.
3.Put remaining flour in a bowl with the baking powder. Add the water, whisk together, then stir into tomato mixture.
4.To make the saffron chilli mayonnaise, put the mayonnaise in a bowl and add the chilli. Place saffron in a small cup, add hot water, mix well, then fold into the mayonnaise. Set aside.
5.Heat a little olive oil on the barbecue hotplate. Working in batches, cook spoonfuls of fritter mixture on the hotplate for 1–2 minutes on each side or until golden. Drain on paper towels.
6.Serve fritters with saffron chilli mayonnaise and dressed salad leaves, if using. Garnish with basil and mint.