In a large bowl, whisk together the cornstarch, dry mustard and pepper.
Add in the grated cheese, and toss to coat with the cornstarch mixture.
In a medium saucepan or fondue pot, place the wine, lemon juice and garlic.
Bring to a low simmer over medium heat, then add a handful of cheese mixture and stir until melted in completely. Repeat until all of the cheese has melted in.
If the mixture is too thick, add a little more wine until it reaches the desired consistency. Add in the nutmeg and salt if desired.
Transfer to a fondue pot and place over the heat, or simply move the fondue pot over to it's holder. Place in the middle of the prepared dipping foods. Serve the food with fondue forks or wooden skewers. Dip and enjoy!
Notes
Note: You can adjust the mustard, lemon juice and garlic to taste as preferred.