Squash Blossom Grilled Cheese

INGREDIENTS

• 1 tablespoon olive oil
• 2 shallots, peeled and minced
• 1 tablespoon fresh garlic, minced
• 1 tablespoon chopped fresh tarragon
• 1 tablespoon fresh thyme leaves
• 1 tablespoon chopped fresh basil
• 1 tablespoon snipped fresh chives
• 6 ounces plain goat cheese
• Salt and freshly ground pepper, to taste
• 1 1/2 cups soda water, plus more if necessary
• 1 cup unbleached all-purpose flour
• 1/2 cup cornstarch
• 1 tablespoon baking powder
• 1 teaspoon cayenne pepper
• 12 fresh squash blossoms
• 6 ounces shredded mozzarella cheese
• 12 slices sourdough bread
• Canola oil, for frying
• Olive oil, for brushing