Halve baguette and brush the cut surfaces with olive oil.
Place on a baking sheet and roast in oven with hot air until they are crispy.
Peel onion and garlic and chop finely.
Break up tuna with a fork and spread the baguette slices, crumbs the sheep cheese upon. Sprinkle with garlic and onion.
Gratinate baguettes at 180 ° C for about 15-20 minutes.