Avocado and Banana Guacamole

I haven’t tried this one yet, but it seems like a good way to stretch a single avocado into a larger batch of slightly sweet guacamole.

1 ripe avocado
1 large ripe banana
1/2 medium lime
2 T mayonnaise
1/2 t salt
1/8 t pepper
1 small onion, diced
1 tomato, diced (optional)

Mash the avocado and banana together, then mix in the remaining ingredients. Serve with chips or crackers.