
Put the pistachios, grated pecorino cheese, whole peeled garlic clove, basil and olive oil (start with ⅓ cup/70ml) in a bowl or container and blitz to a smooth paste using an immersion blender. If the pesto is too thick you can adjust the consistency by adding a small amount of olive oil at a time. Set the pesto aside.
Taste the pesto for seasoning but it shouldn’t need any salt or pepper.
Heat a griddle pan on a high heat. Cut the ciabatta bread into slices and drizzle them lightly with olive oil on each side.
When the griddle is hot, char-grill the bread on each side then set aside.
Spread each slice of bread with a little pistachio pesto. Top with a piece of mortadella (slices are usually quite big so tear the mortadella to fit the bread). Add a small spoonful of burrata then top that with about ½ teaspoon of pistachio pesto. Sprinkle over some chopped pistachios and serve.