Asparagus Soup

Serves 4-6

1 pound asparagus spears
1 tablespoon unsalted butter
1 tablespoon olive oil
1 medium onion, chopped
Salt
4 cups chicken stock
1/2 cup heavy cream
Freshly ground black pepper
1/4 cup finely grated Pecorino Romano cheese

Trim and discard the woody ends of the asparagus. Cut and reserve 4-6 asparagus tips, 2 inches in length. Slice remaining spears in 1/4 inch pieces.

Melt butter with the oil in a soup pot over medium heat. Add onion and 1/2 teaspoon salt. Sauté onion until translucent without browning, about 2 minutes. Add asparagus pieces and sauté until brightened in color and beginning to soften, 2 minutes. Add stock; bring to a boil then reduce heat and simmer, partially covered, until asparagus are very tender, about 20 minutes.

While the soup is simmering, blanch the reserved asparagus tips in salted boiling water until bright in color, 30 seconds. Drain and rinse under cold water; set aside.
Purée soup with an immersion blender or carefully in batches in a food processor. Return to soup pot. Add cream and black pepper and heat through to serving temperature. Taste for seasoning. Serve in bowls or glasses, sprinkled with pecorino cheese. Garnish with asparagus spears.