Lady Muck's marshmallow fluff

Looking through whoppie pie recipes, I saw that a lot of them were filled with marshmallow fluff. The problem being that the fluff is American and even though I live in London I couldn't seem to find it anywhere so I found a recipe instead - So ridiculously simple!

3 egg whites
250 ml of Corn syrup which us English tend to call Golden syrup
1/2 tsp of salt
260g icing sugar

Whisk the whites with the syrup on full speed until the mixture is stiff and holds its own. Add the salt and the icing sugar until completely mixed through.

Done, so easy!

The mixture makes enough to fill about 3 or 4 jam jars.