Heat the oven to 275°F7135°C7gas 1. Arrange the tomato halves, cut-side up, on a large rimmed baking sheet and drizzle the olive oil over them. Scatter the garlic slices and fennel seeds over the tomatoes, and season with a generous sprinkling of salt and a few grinds of pepper.

Roast the tomatoes for 3 to 4 hours, or until they have begun to collapse and are caramelized but are not dry. They should have some shriveling but still look juicy. Let them sit until they are cool enough to handle. Then chop them coarsely and transfer them to a warmed serving bowl, along with any oil and juices left in the pan. Keep warm.

Bring a large pot of water to a rolling boil and salt generously. Add the pasta, stir to separate the noodles, and cook according to the manufacturer's instructions until al dente. Drain the pasta in a colander set in the sink, reserving about 1 cup/240 ml of the cooking water.

Transfer the pasta to the serving bowl and strew the robiola pieces over it. Toss gently to combine the pasta, tomatoes and cheese thoroughly, taking care to break apart any large chunks of cheese that stick together. Add a little of the hot cooking water to the bowl to help melt the cheese a bit but not too much - you want some pieces in there. Taste and adjust the seasoning with salt and pepper, if you like. Serve immediately.