Peel and finely dice the onion and garlic. Clean and wash the celery and cut into fine strips. Peel, wash and chop the carrot. Heat butter and oil in a large pot. Add onion, garlic, celery, carrot and 1 pinch of sea salt and stir-fry over medium heat for about 10 minutes until everything is soft, but not burning
Chop the chilli very finely. Add the chilli and 1 tbsp. cumin to the vegetables and stir-fry for approx. 5 minutes until it begins to smell
Mash the tomatoes in their own juice with your hands. Add to the vegetables and simmer for about 5 minutes. Chop the apricots finely. Season the tomatoes with 1 teaspoon salt and sugar. Add the stock, bring everything to the boil. Reduce the heat and add the apricots and lentils. Simmer everything for 15-20 minutes. Season the lentil soup with salt and pepper