Drain and rinse the can of garbanzos. Then pour them onto a baking sheet. Drizzle enough olive oil over to lightly coat the beans. Use about a tablespoon of rosemary. I only had dry and that worked fine, but fresh may be better. Crush it up in your fingertips while sprinkling it over the beans. Then put the baking sheet in the oven for 15 minutes. After 15 mins, take the beans out of the oven. Stir them around and add a light dusting of sea salt. Then cook for another 10 minutes. When they are done, take them out of the oven and let them cool a bit. They will be golden brown and many will have split open. Enjoy while warm or cool.