Cauliflower Mac and Cheese

Halve any large cauliflower florets and pop them into an ovenproof dish. Drizzle with oil and season with salt and pepper, then toss to coat. Spread out in a single layer. When the oven is hot, roast on the top shelf until golden brown and tender, 15-20 mins. Turn halfway through.

Meanwhile, when your pan of water is boiling, add the macaroni and bring back to the boil. Cook until tender, 12 mins. Once cooked, drain in a colander and pop back into the pan. Drizzle with oil and stir through to stop it sticking together.

While the pasta cooks, heat the oil for the roux (see ingredients for amount) in a saucepan on medium-high heat. When the oil is hot, stir in the flour (see ingredients for amount). Cook until it forms a paste, 1-2 mins - you've made a roux! Gradually stir in the water for the sauce (see ingredients for amount) and the vegetable stock paste. Bring to the boil, stir and simmer until thickened, 1-2 mins. Stir in the creme fraiche, then remove from the heat.

Add the Cheddar cheese to the sauce and stir until melted. Taste and season with salt and pepper if needed. Return the pan to low heat and stir in the spinach a handful at a time until wilted and piping hot, 1-2 mins, then remove from the heat. Stir the roasted cauli and the cooked pasta through the sauce, then pour into the ovenproof dish. Turn your grill on to high.