Peel and quarter the onions. Rinse pulp, pat dry. Boil up with onions, garlic and red wine and simmer covered for about 1 1⁄2 hours until soft.
Wash the potatoes well and cook them with their skins in salted water for about 25 minutes. Clean and wash spring onions, if necessary cut them into long pieces. Tomatoes wash, halve. Sort and wash the arugula and let it drip off.
For the fruit oil, cut passion fruit in half and scrape out the flesh. Lightly whip the oil with a whisk. Season with salt and pepper. Drain the potatoes and cut in half lengthwise.
Halve the chorizo slices and place between two layers of baking paper. Heat up a pan (or grill pan). Place chorizo with paper inside, weigh down with a pot and fry the sausage until crispy. Take it out. Fry the potatoes and spring onions in hot frying fat and take them out.
Lift out the pulpo with a skimmer. Remove the dark skin from the tentacles and cut the tentacles into small pieces. Fry them crisply in the hot pan. Finally fry garlic (from the red wine stock), tomatoes, potatoes and spring onions briefly. Arrange everything. Garnish with chorizo and rocket. Drizzle with some passion fruit oil, add the rest of the oil.