Cream of Mushroom Soup (makes about 3 quarts, approx. 10 servings)

4 ounces (110 g) butter	melt	sweat 6 min.	stir in and cook 12 min.	gradually stir in	stir in 1/2 cup at a time until 4 cups	stir in rest of milk	bring to boil	simmer 45 min.	fold in, simmer 10 min.	stir in, remove from heat	season to taste
4 ounces (110 g) diced onions	wash and dice
2 oz. (55 g) celery
2 oz. (55 g) leeks
1/3 cup (70 g) flour
1 cup (235 mL) chicken broth or stock
7 cups (1.65 L) whole milk
12 to 16 ounces (340 to 450 g) button mushrooms	dice
1/4 teaspoon (0.4 g) dried, ground tarragon
1/2 cup (120 mL) heavy cream
lemon juice
salt
pepper