Crispy Blueberry Grilled Cheese
- 1 pint fresh blueberries
- 1/4 cup white sugar
- Juice of 1 lemon
- 1 small bundle lemon thyme, bundled with kitchen twine
- 8 slices sourdough bread, each 1/4 inch thick
- 4 oz white cheddar, grated
- 4 oz whole mozzarella cheese, shredded
- 4 tbsp butter
- Flaky sea salt, for finishing