Peel and chop the onions. Heat 1 tablespoon of oil in a large pot and sauté the onions for about 2 minutes. Add 600 g peas and fill up with broth. Bring the soup to the boil and simmer for about 8 minutes at low heat.
Wash mint, shake dry. Pluck off leaves and chop finely, except for something to garnish. Puree the soup with a blender and pour it through a coarse sieve into a pot. Stir in 3 tablespoons of crème fraîche and chopped mint.
Season to taste with salt, pepper and lemon juice. Keep warm.
Dab the meat dry, cut it into strips about 2 cm wide and put them on skewers in a wavy shape. Heat 2 tablespoons of oil in a frying pan. Season the meat with salt and fry it for about 6 minutes, turning it over.
Fill soup into bowls. Spread 4 tablespoons of peas on top. Add a teaspoon to each soup with remaining crème fraîche, garnish with mint and serve immediately with chicken skewers.