Remove the rind from the Gruyère and mountain cheese and grate them into the caquelon on the rösti grater. Add the Schabziger cheese with a Bircher grater. Add apricots, chili and fermented apple juice, mix. Close the caquelon with cling film. Marinate for 30 minutes or longer.
Stir cornstarch with the fermented apple juice until smooth.
Melt cheese mixture over medium heat, stirring constantly, stir in binder, heat fondue again.
Place the caquelon on the lit rechaud, keep the fondue at the boiling point, stirring frequently.