Franco showed me how too prepare sardinas at the local DIY here in Barcelona couple days ago. Not happy of the 365 €2,75 jamon y queso bocadillo + Bebida, he decided to get himself 3 cans of sardinas and got Tom to go buy also an avocado and some cherry tomatoes for extra cream and juice to the sandwich. You would think this is simple, exactly like when we Italian say about cooking pasta is easy, but I tell you what.. Make sure to check exactly when he puts the bananas and the cherry tomatoes on top of the flaming cans, how many napkins he set on flame and the full process in general, you can also get in touch with him if more question arise.
Anyway, If you followed all the steps it should look something like this.