Step by step recipe:

1. 5 min.
   Cut 500 g fresh tuna into fairly large dice, keeping only the good flesh.
   
   Put into a bowl.
2. 3 min.
   Zest 1 lime and add this to the tuna.
3. 3 min.
   Add the juice of the lime, 2 tablespoons chili spices, 1 sprig thyme, 1 bayleaf, 1 sprig rosemary, 5 leaves sage, 5 tablespoons olive oil, salt and pepper.
4. 2 min.
   Mix to blend all the flavours, then cover and refrigerate.
5. 1 hour
   Shell 500 g prawns, put into a bowl and add 4 tablespoons vinegar, 5 tablespoons olive oil, 2 tablespoons chili spices, salt and pepper.
   
   Mix well to blend the flavours, then cover and refrigerate.
   
   These two preparation stages can be done the day before and left overnight in the fridge. If not, 1 hour will do.
6. 10 min.
   When it is time to cook, tip the contents of the bowls out onto the plancha, but keeping them separate, and cook like this.
   
   If your plancha is small, cook them one after the other.
7. 10 min.
   Serve onto individual plates with your choice of accompaniment. Here, it is pilau rice with sesame.