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Heat the grill to medium. Thread a piece of sausage onto each skewer, followed by a piece of bread, a bit of pancetta and a tomato, then repeat with the remaining ingredients – you should have two of everything on each skewer.
Line a baking tray with foil, scatter over the rosemary, and place a rack on top with the skewers. Drizzle over the oil and grill for 20-25 mins, turning every few mins, until everything is cooked through and crispy. If the bread is blackening too quickly, turn it round every min or so.