Shell the Pistachios if you haven't bough pre-shelled ones already. If you can and if you have the time, also peel the Pistachios. This will result in a richer nut flavor and a greener cream.Finely grind the Pistachios in a food processor or with a blender.
2 handful Pistachios
If you're looking for a lighter sandwich, you can skip the ricotta and blend the pistachios together with some olive oil and pecorino or parmesan cheese. This will give you a lighter, pistachio-pesto sauce.Mix well together the ricotta with the ground pistachios to a smooth cream and season with salt and pepper. Spread the cream onto the bottom half of the Schiacciata bread.
Add the sliced Mortadella and spread the Burrata on top of it. Finely sprinkle with some remaining ground pistachios, some olive oil and a little sea salt.