Chilled Asparagus Soup with Herbed Shrimp

Name: Chilled Asparagus Soup with Herbed Shrimp
Ingredients: 3 Tbsp. extra-virgin olive oil, divided; 3 medium leeks (13 oz.), white and light green parts only, split lengthwise, rinsed well, and thinly sliced; Kosher salt; 3 medium garlic cloves, finely minced (1 Tbsp.); 2 medium russet potatoes (1¼ lb.), peeled and coarsely chopped; 2 quarts vegetable stock; 5 sprigs thyme; 2 bay leaves; 1 lb. coarsely chopped asparagus (3 cups); 6 sprigs tarragon; 1 cup heavy cream; 2 Tbsp. fresh lemon juice; 2 Tbsp. champagne vinegar; Freshly ground black pepper