In a large pot, melt butter and add onions, leeks, celery, carrots and potatoes. Sauté vegetables over medium high heat for five to ten minutes or until almost tender.
Reduce to medium and add flour, salt, pepper, sage and thyme. Cook for five minutes stirring with a wooden spoon and being careful that the mixture does not stick.
Add vermouth and scrape up any browned bits from the bottom of the pan.
Add stock, bring to a boil and reduce to a simmer. Cook for 10-15 minutes until the vegetables are tender and soft.
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