Clean and wash fresh beans. Cook the beans in a good 1/4 litre of salt water for about 16 minutes. Peel and finely dice the onion. Coarsely chop peanuts and roast them in a pan without fat. Take them out.
Leek onions clean, wash, halve lengthwise if necessary and cut into pieces of about 5 cm. Wash the coriander, dab dry and pluck the leaves from the stems. Dab roast beef slices dry and spread thinly with 4 tablespoons peanut butter.
Place 1/2 piece of spring onion on each and roll up. Fix with wooden skewers. Cover some roulades with coriander. Heat oil in a pan. Brown the roulades in it all around. Season with a little salt and pepper.
Deglaze with a good 200 ml of water, bring to the boil. Stir in stock and 1 tablespoon peanut butter. Cover and stew for about 5 minutes. Drain the beans. Heat the fat. Steam onion in it. Add beans and peanuts and toss.
Stir the sauce thickener into the roulade stock. Bring to the boil again and season to taste. Serve everything. Garnish with the rest of the coriander.