CHANTENAY CARROT RISOTTO

500g Waitrose Small Chantenay Carrots, ends trimmed and scrubbed •1 litre fresh Cooks’ Ingredients Vegetable Stock •4 tsp olive oil •20g unsalted butter •1 onion, finely diced •1 celery stalk, finely diced •4 garlic cloves, crushed •250g arborio rice •175ml dry white wine •40g parmigiano reggiano, finely grated, plus extra to serve