Dice the beetroot and fennel. Mix the cubes with 2 tablespoons of olive oil and bake on a baking sheet lined with baking paper for 30-35 minutes at 190 ° C.
Tip: This step can be omitted if you use vacuum-sealed, pre-cooked beetroot.
Dice the onions. Chop the garlic into small pieces. Peel the apples, remove the core and cut into pieces. Steam the onions in about 1 tablespoon of olive oil. Fry the garlic and apples for 2 minutes. Add the beetroot and fennel cubes. Pour the vegetable stock and simmer for about 15 minutes.
Puree the soup finely and season with salt and pepper.