Chilled English Pea Soup with Crab and Meyer Lemon

Name: Chilled English Pea Soup with Crab and Meyer Lemon
Ingredients: 2 tablespoons olive oil, plus more for garnish; 1 small sweet onion, diced; 2 small celery stalks, diced; 1 garlic clove, smashed; 2 teaspoons kosher salt, divided; 3 cups whole milk, divided; 4 pounds fresh English peas, shelled (about 5 cups or 30 ounces shelled peas); 2 bunches watercress (about 4 ounces), rinsed; 1 teaspoon ground white pepper; 1/4 cup crème fraîche; 1 tablespoon chopped fresh chives, plus more for garnish; 1 tablespoon chopped fresh dill; 1 tablespoon chopped fresh tarragon; 1 teaspoon Meyer lemon zest; 3 tablespoons fresh Meyer lemon juice, divided; 1/2 pound cooked Dungeness or other lump crabmeat; Pea tendrils and freshly ground black pepper, for garnish (optional)