Ingredients
240g plain flour, plus more for dusting
2 tsp. fine sea salt, divided
175g chilled unsalted butter, cut into pieces
1 Tbsp. apple cider vinegar
250g tomatoes, sliced ¼" thick
2 garlic cloves, thinly sliced
120g firm cheese (such as cheddar, or gouda), finely grated
1 large egg, beaten to blend
Flaky sea salt
Freshly ground black pepper
½ lemon
1 Tbsp. finely chopped chives or other herbs