To make the Guacamole:
Remove the avocado pulp from the skin and mash it in a bowl with a fork.
Add the rest of the ingredients and stir until nicely mixed together.
For the Quesadillas:
Spread a thin layer of refried beans over the whole surface of one of the tortillas.
Top with the guacamole, spreading into another thin layer on top of the refried beans.
Place the other tortilla on top and press down lightly to make sure it sticks together.
Bring a large flat frying pan to medium heat. I usually fry these dry without any oil, but oil makes them lovely and crispy.
Fry on one side until lightly browned. Flip using your hand or a plate, and fry the other side.
Remove to a plate and cut into triangles.