Creamy red deer stew

Ingredients

• 500g Lapin Liha’s red deer meat cubes
• 25 g butter
• 2 onions, quartered
• 3 dl water
• 2 tbsp game and chanterelle stock concentrate
• 2 dl heavy cream
• 1 tbsp coarse Dijon mustard
• 1 tbsp fresh tarragon, chopped
• 500g celery root
• 500g floury potatoes
• 2 dl milk
• 50 g butter
• Salt, white and black pepper
• 1 dl water
• 1/2 dl granulated sugar
• 2 tbsp spirit vinegar (12%)
• 4 beetroots