How to Make It
Arrange 4 slices of the sourdough bread on a work surface and top with mozzarella. Cover with the sun-dried tomatoes and the mushrooms. Drizzle 1 teaspoon of the tomato oil over each sandwich and top with a basil leaf. Close the sandwiches.
Heat a griddle. Brush the sandwiches with the olive oil, transfer to the griddle and weight them down with a heavy pan. Cook over moderate heat, turning once, until the bread is golden and the cheese is melted, about 9 minutes total. Cut into pieces and serve right away.