Sevilla is reputedly the birthplace of tapas, which may or may not be the case, but there is no doubt that it is the preferred way of dining out here.
A few years ago I started the Sevilla Tapas blog and there you can find my favourite tapas bars and restaurants in Sevilla, listed by barrio and cuisine.
If ordering food out on your own feels a bit daunting, please try one of my Sevilla Tapas Tours, which are very casual and informative, and will set you up for the rest of your stay here.