Heat oven to 180C/160C fan/gas 4. Toss together the oats with the mixed spice, roughly chopped walnuts and carrot (after squeezing out excess liquid) in an oven tray. Stir through the melted unsalted butter or coconut oil and the runny honey, then bake for 35-40 mins until golden brown, stirring halfway. Leave to cool completely, stir through the sultanas and store (see below). Serve with thick Greek yogurt and fruit, such as berries and sliced apple, or sprinkle on a carrot cake.