Even when you date the wrong guy, he can leave you with something worth your time...this sandwich has stood the test of time, even though the relationship didn't! LOL! I didn't like many vegetables back when I dated a guy who'd been taking cooking lessons. He made this sandwich for me, and even though he got the boot, the sandwich has stayed in my life for the ensuing 25 years...love this!
Heat pan/skillet to medium. Spread mayo onto inside slice of rye. Top with Swiss, alfalfa, tomato slices, and avocado. Spread mayo on inside of second piece of bread and press together into sandwich. Heat butter or margarine in pan and grill sandwich on both sides until golden brown and Swiss is melted. Slice and serve.