Pesto is a great way of getting children to eat more greens. In this recipe you can switch kale for spinach, depending on which you have to hand. You can also vary the herbs, depending on what is in season, such as parsley, basil or sorrel. Pumpkin seeds are a much cheaper substitute to pine nuts, which are normally used in pesto. You can however use any nuts, such as walnuts, pine nuts or cashews if you prefer. This pesto is delicious stirred through pasta but can also be served with vegetables, salads or as a pizza topping.