In a mixing glass, gently muddle four lemon wheels with the simple syrup and a pinch of salt. Add the gin, sherry, bitters, and ice cubes, then stir until well chilled, which should take approximately 15 seconds. Proceed to strain the mixture into the pre-chilled glass, ensuring that you top it off with enough crushed ice so that it forms a mound above the rim. Finally, garnish your creation with the remaining three lemon wheels. Serve your Tuxedo Cobbler with a straw.