1) Mix cheeses together in mixing bowl with flour. Place wine in saucepan and bring to a simmer, being careful not to let it come to the boil.
2) Gradually add cheese to wine, adding a handful at a time and stirring constantly until melted. After the last handful has melted, add the kirsch and freshly grated nutmeg, slowly stirring to incorporate. Transfer to fondue pot.
Serve with crusty bread