These Korean style maki (rolls) are perfect picnic food. They're a little time consuming to make, but so easy to eat!
TIPS: For the summer time, instead of the marinated beef, you can use strips of cooked ham, and instead of spinach, you can either use thin strips of cucumber, or julienned perilla (sesame) leaves to lighten it up and keep it easy! Also, they sell roasted sesame seeds in a plastic canister at the Korean market, so you don't have to toast your own.