Gimbap (김밥) are rolls of sesame-seasoned rice and colourful fillings wrapped in roasted seaweed, then sliced into rounds. They are the classic Korean picnic and lunchbox food, sold on almost every street corner nationwide. Unlike sushi rice, gimbap rice is seasoned with salt and sesame oil rather than vinegar, so it tastes nutty and savoury. This vegetarian version is filled with omelette strips, garlicky spinach, carrot, soy-glazed tofu, cucumber and the bright yellow pickled radish called danmuji. They keep well for a few hours, so they are good to make ahead for a trip. Chef's tip: season the rice while it is warm and spread it thin, no more than a few grains deep. Thick rice and wet fillings are the two reasons rolls burst or go soggy.