Beetroot and Cumin Pesto

Name: Beetroot and Cumin Pesto
Yield: Serves 4
Ingredients: 30 g/1 oz/⅓ cup walnuts, toasted; 100 g/3½ oz cooked beetroot, peeled and roughly chopped; 2 garlic cloves, peeled; 50 g/1¾ oz Parmesan, grated; 2 tsp cumin powder; 150 ml/5 fl oz/scant ⅔ cup extra-virgin olive oil; salt and black pepper