• Preheat oven to 400F/200C. Peel the potatoes and dice into bite-size chunks. Toss the chunks of potato in the oil and sprinkle with a little salt in a roasting dish so they are in one layer. Add the unpeeled garlic in the side of the pan if making alioli. Once the oven is ready, roast for around 40min, turning once, until they are lightly golden.

For bravas sauce

• Meanwhile make the bravas sauce (alternatively you can make it ahead and keep refrigerated). Cut the onion into a fine dice and finely chop the garlic. Start warming the oil in a skillet/frying pan and add the onion before it has become hot. Cook for around 5min until softening then add the garlic. Cook another approx 10min until it is starting to color but not burning (if it looks like it might, reduce heat and add a little oil if needed).
• Add the cayenne, paprika and cumin and cook a minute before adding the wine - take care it may splutter a little - and tomatoes then simmer for around 10-15min until it has reduced a little. Blend the sauce until smooth and leave to cool.

To finish

• When the potatoes are ready, remove from oven. If using, pop the garlic from the casings and mash in with the mayonnaise. Serve the potatoes with the sauce(s) on the side or drizzled over the top.