Beat egg slightly in a bowl; add in oil, water and hotcake mix. Stir just until slightly lumpy (Do not overmix). Pour 1/4 cup batter onto a pre–heated greased square waffle griddle. Cook until golden brown. Spread some mayonnaise on one side of the waffle, top with a slice of ham and cheese and garnish with lettuce and tomato. Cover with another piece of waffle. Cut into 4 then serve. Do the same procedure with the remaining ingredients and waffles.