Melt in a large saucepan over medium heat:
Add and cook gently for 5 minutes:
Do not let the vegetables brown. Add:
Bring to a boil, then reduce the heat and simmer gently, partially covered, for 40 minutes. Strain and let cool uncovered, then refrigerate covered. Season to taste with:
Store refrigerated for up to 4 days or freeze for up to 6 months.