Clean and wash the corncob, cut the underside of the corncob smooth, place on a work board and use a sharp knife to cut the grains straight down from the cob. Peel and finely chop the onions.
Peel and finely chop the garlic. Heat 2 tablespoons of oil in a saucepan and fry the onions until transparent. Add garlic and corn grains, fry briefly. Dust with cumin. Deglaze with milk, stock and 150 g cream, bring to the boil, cover and cook for about 40 minutes.
In the meantime clean and wash the spring onions and cut them into fine rings. Heat 1 tablespoon of oil in a small pan and fry the spring onions lightly while turning them. Remove from the pan and put aside.
Whip 100 g cream with the whisk of the hand mixer. Using a slotted spoon, lift a few corn grains out of the stock, drain and set aside. Remove the corn in the stock from the stove and puree finely with a blender, pass through a sieve.
Put back into the pot, heat up. Add the rest of the corn grains and spring onions, season again with cumin, salt, sugar and pepper. Leave bacon in a pan without fat until crispy. Serve the soup with a blob of whipped cream and a slice of bacon in small bowls.