1. Cut the potatoes in half, rinse with cold water, drain lightly, place in a heatproof container, cover with plastic wrap and microwave for about 2 minutes (600W). Drain and sprinkle with salt. Cut the tomatoes in half.

2. Spread the drained tuna, edamame, cherry tomatoes and cheese over the potatoes and cook in a toaster or on the grill until the cheese is melted and lightly charred.