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½ large onion, finely diced
1 tbsp unsalted butter
2 tsp fresh rosemary leaves, finely chopped
100 g grated Cheddar and mozzarella cheese
1 heaped tbsp cranberry sauce
¼ tsp freshly ground black pepper
1 small pinch salt, optional
3–4 tbsp cranberry sauce, for serving
Fresh rosemary sprigs, optional garnish