I had this pesto served on top of a small Sardinian pasta called cicioneddos, which is a form of malloreddus. Any sort of compact, handmade pasta would be fine. Even orecchiette.
Ingredients
400 grams cicioneddos (or malloreddus)
70 grams fresh pecorino sardo, grated.
grated rind of one lemon
80 grams / 1/3 cup green olives, pitted
80 grams / 1/3 cup black olives, pitted
50 grams / 1/4 cup capers
75 grams / 5 tablespoons butter
75 grams / 5 tablespoons olive oil
150 grams good quality tuna, packed in olive oil
Instructions
Roughly chop the olives and the capers. Melt the butter and add the olive oil. Mix the fats with the chopped ingredients, along with the tuna.
Cook the pasta in boiled, salted water. When done, drain, and toss with the pesto, adding the lemon rind and the grated cheese.
Recipe by Elizabeth Minchilli at https://www.elizabethminchilli.com/2014/09/sardinian-pasta-shapes-video/