Asparagus Soup with Crab Crostini

Name: Asparagus Soup with Crab Crostini
Ingredients: 2 lb. asparagus, tough ends trimmed; 1 Tbs. olive oil; 1 cup thinly sliced spring onions or sweet onion; 3 1/2 cups chicken or vegetable broth; 1/2 tsp. salt, plus more, to taste; 3/4 lb. cooked fresh lump or drained canned crabmeat, picked over to remove any shell fragments; 3 Tbs. minced green onion; 1 Tbs. fresh lemon juice; 2 Tbs. mayonnaise; 1/2 tsp. Dijon mustard; Freshly ground pepper, to taste; 1/4 cup fresh orange juice; 8 slices artisan-style sourdough bread, each 1/2 inch thick; 1 cup grated pecorino or dry jack cheese