Pumpkin soup with goat's cheese

Ingredients

• 1.3kg pumpkin or squash, peeled and cut into 2-3cm chunks (you want 850g flesh)
• 200g banana shallots, skin on, halved lengthways
• 1 small head garlic, skin on top centimetre sliced off
• 3 sprigs rosemary
• 2 teaspoons dried chilli flakes (optional)
• 4 tablespoons extra-virgin olive oil
• Sea salt and freshly ground black pepper
• 750ml good chicken or vegetable stock, plus extra if needed