Mushroom Barley Soup

This freezes well and tastes even better the next day.

2 tbsp butter, divided
2 1/2 cups onions, chopped
1 cup celery, chopped
1 1/2 cups thinly sliced carrot
2 8-oz packages mushrooms, sliced
1 cup pearl barley
10 cups chicken stock
3/4 tsp salt (this depends on how salty your stock is)
1/2 tsp dried thyme

Heat 1 1/2 tbsp butter in a large skillet over medium-high heat until it bubbles.  Add the carrots, celery and onion to the pan and saute 5-6 minutes until they start to lightly brown on the edges.  Add mushrooms and saute until they soften, about 5-6 minutes.  Set aside.  In a large saucepan, melt the remaining 1/2 tbsp butter over medium-high heat until bubbly.  Add barley and stir constantly until it brown a little, between 6-8 minutes.  Add stock to barley and add vegetables to pan.  Add salt and thyme.  Simmer 20 minutes and taste.  Add more salt if necessary.  

Makes about 13 cups