Grease microwave-safe dish and spatula with vegetable shortening. Place marshmallows and water into dish and microwave on high for one minute. Remove and stir well.
Microwave on high for 30-second intervals until the marshmallows are completely melted.
Remove from microwave and add the
gel colour(s) and the remaining ingredients, except the sugar. Stir with the spatula to combine.
Add half the sugar and mix until fully incorporated.
Pour the remaining sugar onto a clean counter and place the fondant on the sugar.
Slowly knead the fondant, working from the outside in. Knead until most of the sugar is incorporate.
Rub your hands with a generous amount of vegetable shortening and continue kneading the fondant until it becomes smooth and confectioners sugar is incorporated.
Continue to add a little shortening until it’s pliable and smooth.
Coat again with vegetable shortening and wrap in two layers of plastic wrap. Place in a zip-top plastic bag and allow to rest at room temperature overnight.