Kale, onions and chestnuts

Method

To make the pizza dough, put the flours in a large bowl with the salt and yeast. Mix well. Add the oil and 325ml warm water and mix to a rough dough. Flour your hands a little. Tip the dough out on to a work surface and knead for 5–10 minutes until smooth. This is quite a loose, sticky dough – as it should be – so try not to add too much flour. It will become less sticky as you knead.

Trickle a little oil into a bowl, add the dough and turn it. Cover with a tea towel and leave in a warm place to rise until doubled in size, 1–2 hours. Preheat the oven to 250°C/Gas 9, if it goes that high, or at least 220°C/Gas 7. Put a baking sheet in to warm up.

Meanwhile, add the kale or cavolo to a pan of boiling salted water and cook for about 3 minutes until tender. Drain in a colander and refresh under cold water. Drain, then squeeze out excess water.

Return the pan to a medium heat. Add a dash of olive oil and the butter (if using). Sweat the onions for 10 minutes or until soft and golden. Take out half and combine with the kale. Add the garlic and chestnuts to the onions in the pan and cook for 5 minutes. Add 200ml water and simmer for 2–3 minutes. Reduce to a rough purée with a handheld stick blender. Season.

Tip the dough out on to a lightly floured surface and deflate with your fingers. Rest it for a few minutes, then cut into three. Roll out one piece as thinly as you can. Scatter a peel (pizza shovel) or another baking sheet with a little flour (or polenta) and place the dough base on it. Spread one-third of the chestnut purée over the base, then scatter over one-third of the kale and fried onion. Give the whole lot a generous trickle of olive oil and a sprinkle of salt.

Slide the pizza on to the hot baking sheet in the oven (for a really crisp crust). Or, simply lay the baking sheet on the hot one in the oven (to avoid the tricky pizza transfer). Bake the pizza for 10–12 minutes until crisp and golden brown at the edges – even a little burnt in places. Repeat with the remaining dough and topping.