Step #1 Combine tuna, pecorino, baby spinach leaves & oregano In a large-ish bowl, season to taste with salt & freshly ground pepper, add the eggs, beans, & mix well, using a fork.
Step #2 Heat the oil In a large-ish, heavy-based, non-stick pan over a medium-high heat; add the egg mixture & cook for 2-3 mins until it is setting around the edges.
Step #3 Using a spatula or egg slide, slightly lift around the edges to allow some of the uncooked mixture to run under the sides.
Step #4 Cook for another 2-3 mins or until it is set around the edges but still soft in the middle.
Step #5 Invert the frittata onto a plate, & slide back into the pan for another 3 mins or until almost cooked in the middle.
Step #6 Remove from the heat & allow the frittata to stand for 5 mins in the pan.
Step #7 Serve with warm crispy rolls & salad greens.