Boil the beets, peel them and beat them in the blender (or food processor) together with the garlic, lemon, vinegar and olive oil. Empty the contents of the blender into a bowl.
Next, finely chop the parsley, crush the walnuts in the mortar, and add them to the bowl with the content of the blender. Add salt and pepper to taste, and mix well.
Taste, and if necessary add garlic, lemon, vinegar, salt or pepper for extra intensity.
Serving
It can be served cold, or at room temperature, as:
Instead of walnuts you can use hazelnuts, almonds or sunflower seeds.
You can replace parsley with celery or fresh cilantro.
When you remove the beets from the pot, put them in cold water to stop the boiling, but also so that you can serve the beetroot dip at room temperature and not too hot.