15-minute Cold Beet Soup

Ingredients

• 1 l kefir
• 1 long cucumber
• 4 hard-boiled eggs
• 500 g marinated beets
• a small punch of dills
• 1/2 tsp horse-radish
• 1/2 tsp mustard ((rather spicy one))
• kosher salt to taste ((regular salt can also be used))
• 3 radishes