Barszcz czerwony (Wigilia clear beet broth)

Ingredients

• 2 lb red beets peeled and thinly sliced
• 2 carrots sliced
• 1 parsley root or parsnip sliced
• 1/4 celery root cubed
• 1 onion halved and charred in a dry pan
• 1/2 oz dried porcini mushrooms
• 10 cups water
• 2 bay leaves
• 5 allspice berries
• 5 black peppercorns
• 3 cloves garlic crushed
• 1 cup beet kvass or 3 tbsp lemon juice zakwas buraczany
• 1 tsp sugar
• 2 tsp kosher salt plus more to taste