Slice the tomatoes thickly. Lightly coat with olive oil, salt, and pepper.
Grill over medium heat on both sides until nicely charred; set aside.
In a bowl, combine the ricotta, lemon juice, lemon zest, salt, and pepper.
Slice and toast the sourdough.
Lay the toast on a plate, spread generously with the lemon ricotta, and top with the grilled tomatoes.
Drizzle with balsamic glaze and scatter with finely chopped basil. Garnish with a few whole basil leaves and serve.