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Preheat the oven to 200°C/180°C Fan/Gas Mark 6. In a large bowl, mix together the mince, pesto and salad onions. Using damp hands, shape into four even-sized burgers.
Cook the burgers in a large, non-stick frying pan for 5-8 minutes on each side until browned and completely cooked through.
Meanwhile, heat the ciabatta rolls for 8-10 minutes, according to packet instructions.
Split the rolls and place a couple of tomato slices on the base of each. Top with the burgers, drizzle with a little extra pesto if you wish, replace the top of the roll and serve.