Butternut Squash Coconut Soup with Basil Pesto

Name: Butternut Squash Coconut Soup with Basil Pesto
Ingredients: 800 grams butternut squash; 1 onion; 1 garlic clove; 2 tablespoons olive oil; 1 teaspoon ginger paste; 1 teaspoon lemongrass paste; 1/2 teaspoon cinnamon; 1 teaspoon dried chilli flakes; 400 milliliters coconut milk; 700 milliliters vegetable stock; 4-6 teaspoons good quality basil pesto; salt and pepper