Paul McCartney's refried bean tacos

medium yellow onion, finely chopped

extra-virgin olive oil

of refried beans - I love Amy's Organic Refried Beans, as they come in BPA free cans

medium tomatoes, de-seeded and chopped - I typically use Italian plum tomatoes, but love using heirloom tomatoes in the summer

or two of sea salt

package of whole grain corn tortillas or taco shells

Monterey jack cheese

lime

*Optional - 1-2 teaspoons hot chili sauce - I did not add this because the kid's do not like things too spicy

sliced avocado or guacamole for topping the tacos