Primero Mushroom Bisque - cooking recipe

Ingredients

1/4 c. sweet butter
1 small onion, chopped
1/2 c. chopped celery
3/4 lb. mushrooms, sliced
1 medium-size potato, peeled and diced
1 c. water
1 tsp. salt or to taste
3/4 tsp. fresh, minced thyme or 1/4 tsp. dried
pinch of white pepper
2 c. milk
3/4 c. heavy cream
1/4 c. Amonfillado sherry
2 tsp. soy sauce
sour cream (for garnish)

Preparation

Melt butter in 6 to 8-quart Dutch oven over medium heat.
Add onion and celery.
Cover and cook until transparent, about 10 minutes; stir now and then.