Celeriac, potato and anchovy gratin

Knobbly old celeriac is a sadly undervalued root vegetable. It might not be photogenic, but it’s absolutely delicious, with a sweet, nutty flavour reminiscent of the celery family of which it is a member. The anchovies add a gorgeous depth of flavour – no fishiness at all.

400ml milk, plus extra if needed

400ml double cream

2 garlic cloves, crushed

3 anchovy fillets, very finely chopped

2–3 thyme sprigs

freshly ground black pepper

300g celeriac

300g waxy potatoes

100g grated Comté cheese

green salad, to serve (optional)

For the topping:

100g sourdough or country-style bread, torn into small pieces

2 tbsp olive oil

30g grated Parmesan cheese

Serves: 4 | Takes: about 1 hour, plus 5 minutes cooling

Preheat the oven to 190°C/375°F. Combine the milk, cream, garlic, anchovies and thyme in a 30 x 20 x 5-cm roasting tray and season with pepper.

Peel and very finely slice the celeriac and potatoes, ideally on a mandoline, adding the vegetables to the creamy tray liquid as you go to prevent them browning. Bake for 20 minutes, shaking the tray halfway through. Add a little more milk if necessary so the vegetables are just submerged.

Meanwhile, mix all the topping ingredients together in a bowl. Set aside.

When the vegetables have had their 20 minutes, sprinkle over the Comté, then the topping mix. Bake for a further 30 minutes – the vegetables should be beautifully tender when the time is up. Leave to cool in the tray for 5 minutes before serving – a green salad is the perfect accompaniment.