1.
To make the pesto, combine kale, garlic, pine nuts and Parmesan in the bowl of a food processor; season with salt and pepper, to taste. With the motor running, add olive oil in a slow stream until emulsified; set aside.
2.
In a large bowl, roughly mash eggs with 1/4 cup kale pesto, Greek yogurt, mayonnaise, salt and pepper, to taste.
3.
Serve sandwiches on baguette with arugula, tomatoes and egg salad mixture.