Heat the oven to 400F. On a baking tray, toss the tomatoes, salt, sugar, and olive oil. Roast for 30 - 45 minutes until slumped and slightly brown at the edges.

Meanwhile, combine the cheeses and lemon zest in a bowl until smooth.

When the tomatoes are roasted, remove them from the oven to cool slightly. Place the fillo cups on a baking sheet and bake in the same hot oven for 3 minutes until warm.

Fill the fillo cups with a small spoonful of cheese filling, then top with a tomato. If desired, place cups back in the oven for 5 minutes to heat the filling through.

To serve, sprinkle with scallions and enjoy.