Review of Marshmallow Flavor-TFA:

TFA Marshmallow appears in thousands of good recipes, and for good reason.  Just be aware that if overused it can mute fruit flavors, and that the aroma will probably be more marshmallow-ey than the actual flavor.  If you are looking for a stronger Marshmallow flavor, grab FA Marshmallow.  Even better, but a bit harder to get your hands on... is the best stand-alone marshmallow:  Purilum / PUR Marshmallow.