For a little crunch, garnish bowlfuls with croutons and oyster crackers.
In a large pot over medium heat, melt butter. Cook onion in butter until tender. Stir in beer, carrots and celery. Bring to a boil, then reduce heat, cover and simmer 10 minutes.
Stir in cumin, salt, nutmeg, cloves and pepper. Bring to a boil again, then reduce heat, cover and simmer 30 minutes.
Remove from heat and stir in sour cream and cheese. Serve at once.