“This fish pie is lovely and light: salmon in a rich tomato and fennel sauce, with butter beans, and a delicate mixed nut and oat crumble on top in lieu of pastry or potato,” says cookbook author Annie Bell.

Fish pie with pecan crumble from Eat To Save The Planet by Annie Bell

Ingredients:(Serves 6)

For the filling:

1tbsp extra virgin olive oil1 small dried red chilli, finely chopped4 garlic cloves, peeled and finely chopped2 fennel bulbs, green shoots and tough outer sheath discarded, diced2 x 400g tins chopped tomatoes3tbsp coarsely chopped fresh flat-leaf parsley, plus extra to serveSea salt and freshly ground black pepper600g skinless salmon fillets, cut into 3–4cm pieces200g butter beans, drained and rinsed

For the crumble:

30g pecans30g ground almonds30g rolled oats30g unsalted butter, chilled and diced

Method:

1. Heat the olive oil in a medium saucepan over a medium heat, add the chilli and garlic. Moments later add the fennel and fry for several minutes until translucent and softened slightly. Add the tomatoes, parsley and some seasoning, bring to a simmer and cook for 25–30 minutes, stirring occasionally, until you have a thick sauce.

2. Heat a large non-stick frying pan over a high heat, season the salmon and briefly sear it, half at a time, to lightly colour on all sides. Gently fold the salmon and butter beans into the sauce, discarding any liquid given out by the fish, and transfer the mixture to a shallow ovenproof dish, approximately 20 x 30cm. The filling can be prepared a couple of hours in advance, in which case cover and set aside in a cool place.

3. For the crumble, whizz the pecans until finely chopped in a food processor, then add the ground almonds, oats, the butter and a little seasoning and briefly whizz until the crumbs start to hold together in nibs. This can also be made in advance, and chilled.

4. Preheat the oven to 210°C (fan 190°C/gas mark 6), scatter the crumble over the pie base and bake for about 30 minutes until the crumble is lightly golden. Serve scattered with extra parsley.

Eat To Save The Planet by Annie Bell  is published by One Boat, priced £16.99. Available now.