Spicy Spanish potatoes (patatas bravas)

Method

1. To make the alioli, whisk the egg yolks in a bowl with the crushed garlic and a splash of white wine vinegar. Slowly whisk in the sunflower oil until thick, then season with salt and set aside.
2. Put the potatoes, chopped into large chunks, into a pan of cold water. Bring to the boil, then simmer for 7 minutes. Drain and set aside.
3. Heat 2 tbsp olive oil in a frying pan, then add the chopped onion and sweat for 5 minutes until softened. Stir through the finely sliced garlic clove, hot smoked paprika and chopped red chilli and fry for 1 more minute.
4. Add the chopped tomatoes, rosemary leaves and a splash of sherry vinegar, season, then bring to the boil. Simmer for 15 minutes. Cool slightly, then whizz in a food processor until smooth.
5. Pour ½ cm vegetable oil into a large frying pan and set over a medium heat. When hot, fry the potatoes for 5-10 minutes, turning occasionally until golden and crisp. Drain briefly on kitchen paper, then serve with the tomato sauce and alioli.