Cut sausage, txistora and blood sausage into slices.
Grill for 5', stirring regularly.
Add the arugula and toss for 2'.
Make a wreath with the mixture, and throw the eggs into the center with fleur de sel.
Mix well.
For a “slobbery” result, use a few strokes of the spatula to bind well.
For a “more cooked” version, cook for a few seconds longer.