A gas cooktop includes a gas burner and a grate for supporting cookware above the gas burner. The grate includes a removable insert having an upper surface and a lower surface and a plurality of tines for supporting the removable insert. When the lower surface of the removable insert is contacting the plurality of tines, the grate supports flat-bottomed cookware on the removable insert at a first height above the gas burner. When the upper surface of the removable insert is contacting the plurality of tines, the grate supports flat-bottomed cookware on the removable insert at a second height above the gas burner, the second height being greater than the first height. When the removable insert is not contacting with the plurality of tines, the grate supports round-bottomed cookware on the plurality of tines.