Shortening, for greasing dishes and utensils
15 oz. miniature marshmallows
2 tbsp. water
2 tsp. lemon juice
2 tsp. light corn syrup
1 tsp. clear vanilla extract
½ tsp. lemon or almond extract
½ tsp. salt
7-8 cups confectioners’ sugar
Grease the inside of a microwave-safe bowl and stand mixer bowl with a thin but thorough layer of shortening. Also grease a silicone spatula or two, as well as the hook attachment for the mixer.
In the microwave safe bowl, combine the marshmallows and water. Microwave the mixture in 30 second intervals, stirring in between, until the mixture is melted and somewhat soupy. When the mixture is melted, remove from the microwave and stir in the lemon juice, corn syrup, extracts, and salt.
Place about 6 cups of confectioners’ sugar in the stand mixer bowl and form a well in the center. Pour the marshmallow mixture into the well and knead on low speed with the dough hook until the sugar is mostly incorporated. When the mixture begins to stick to the bowl, add an additional 1 cup confectioners’ sugar and continue kneading.
At this point additional sugar may or may not be needed. (Consistency will vary due to environmental humidity and how light or heavy you scoop your sugar.) The final consistency of the fondant should be totally smooth, but quite thick, similar to modeling clay.* If the mixture becomes too much for the stand mixer, transfer the fondant to a greased work surface and continue to knead with greased hands until the desired consistency is achieved.
*I personally think it is useful to work with store-bought fondant at least once, mainly so you know the consistency you are aiming for.
Form the fondant into a smooth ball, coat lightly with shortening, and wrap tightly in a double layer of plastic wrap. Place in an airtight bag, press out all excess air, and seal. Let rest at least 3-4 hours or overnight before using.**
**I know you’ll want to know how long this lasts. I don’t have an exact answer but I can tell you that I typically make fondant about 4-7 days before I plan to use it (for the sake of breaking up an involved cake) and it is always fine when I use it.