Asparagus Soup

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1/4 cup olive oil

1 cup chopped onions

1/2 cup chopped carrots

1/2 cup chopped celery

1/2 teaspoon ground cumin

1/2 teaspoon ground coriander seed

4 1/2 cups vegetable or chicken stock

1/2 pound potatoes, peeled and diced

1 sprig fresh thyme

1 1/2 pounds asparagus, white ends removed and cut into 1-inch lengths

4 ounces frozen chopped spinach

1/2 cup heavy cream

1/2 teaspoon grated lemon rind

Salt

1 teaspoon white pepper

Toasted croutons, for garnish, if desired