Begin by grating both cheeses.
Add the grated cheese to a mixing bowl, then add the flour. Combine the cheese together with the flour until it's finely coated, then set the bowl aside.
Add the olive oil, mustard, Worcestershire sauce, and seasonings to a medium sized quality pot. Whisk ingredients together, then heat on medium/low.
Slowly add in about 1 cup of the wine, and whisk well. Heat for a few minutes, just until it begins to bubble.
Slowly add in the cheese a little bit at a time, while continuously whisking to keep it smooth.
Add the apple juice, ¼ cup at a time. Also add the remaining wine, ¼ cup at a time. Continue to whisk often and keep the heat on low at this point.
Turn the fountain on and keep the heat on about ten minutes before you're ready to add the cheese. Once the fountain is warm and you've stirred all the cheese into the fondue, carefully spoon it into the bottom dish of the fountain. Power the fountain "on" and serve with your favorite sides.
