Carrot Top Pesto

Name: Carrot Top Pesto
Yield: Serves 4
Ingredients: salt and black pepper; 50 g/1¾ oz Parmesan, grated; 2 garlic cloves, peeled; a small handful of basil leaves; 150 ml/5 fl oz/scant ⅔ cup extra-virgin olive oil; leafy tops from a bunch of carrots, larger stems discarded, chopped; 50 g/1¾ oz/generous ⅓ cup hazelnuts