cream of celery soup

Ingredients

• 4 tablespoons (1/4 cup) butter
• 2 cups leeks, washed and sliced
• 1 cup white onions, chopped
• 5 cups celery, diced
• 1 cup (8 oz) sliced water chestnuts
• ground himalayan sea salt
• 2 large cloves garlic, pressed
• 1/3 cup unbleached all-purpose flour
• 4 cups low-sodium chicken broth
• 1 teaspoon celery salt
• freshly ground black pepper, to taste (i always use mixed peppercorns)
• 1/8 teaspoon cayenne pepper, or to taste
• 2 tablespoons freshly squeezed lemon juice
• 1/2 cup 35% heavy cream, plus more for garnish
• celery leaves, for garnish