There was a cup or so of the Guacamole left over from the party. For lunch the next day I knew I wanted to use it up and guacamole tostadas seemed a natural. Crisp up three corn tortillas in a little bit of oil in a medium hot frying pan. They should brown nicely, but not scorch. Remove from the heat when they're crispy and set aside to cool. Meanwhile, dice some red onion, shred a bit of cheese (a white cheddar is nice, but you can also use queso fresca if you have it handy), and quarter and handful of cherry tomatoes. The tortillas should be cool by now. To assemble, spread a generous layer of the quacamole on the tortilla, then add the red onion. I had a bit of left over corn and some white beans and sprinkled those on at this point as well, just for a bit of added flavor and texture. Next add the tomatoes, which should be seasoned with salt and pepper. Then top with a little bit of the shredded cheese. That's all there is to it. Crunchy, spicy and sweet all at the same time. A perfect simple lunch or dinner.