Lightly Mix The Turkey, Grapes, Parmesan Cheese, And Mayonnaise In A Bowl Until Well Combined. Season To Taste With Salt And Black Pepper. Place The 4 Tortillas Out Onto A Work Surface, And Place 1 Spinach Leaf In The Middle Of Each. Spoon 1/4 Of The Turkey Filling Into Each Spinach Leaf, In A Line. Fold Up The Bottom Of Each Tortilla To Hold The Filling, Then Wrap Tightly. Leave The Tops Open.