Sweet Corn and Clam Chowder

Name: Sweet Corn and Clam Chowder
Ingredients: 1/2 Cup slab bacon or thick bacon, cut into 1/2-inch dice; 3-4 drops olive oil; 2 Tablespoons unsalted butter; 1 small yellow onion, chopped finely, plus 2 yellow onions, diced; 3 bay leaves; 3 sprigs thyme; Salt, to taste; 1 Cup dry white wine; 32 cherrystone clams; 4 Tablespoons olive oil; 1 Cup diced celery (about 3 stalks); Cayenne, to taste; 10 peppercorns; 1 Tablespoon all-purpose flour; 3 medium-sized ears sweet corn, roasted, kernels removed, cobs reserved (2-2 1/2 cups); 1 1/2 quarts heavy cream; 3 Russet potatoes, peeled and diced; Fresh tarragon, chopped finely, for serving