In a large bowl, combine the cheeses with the cornstarch.
On the stovetop, in a fondue pot, bring the white ale to a boil. Over medium heat, gradually add the cheese mixture, stirring after each addition until the cheese has melted. Add the lemon juice. Season with the pepper.
Place the fondue heating plate at the centre of the table. Select the Cheese function and set the pot on the heating plate. Serve with the vegetables, sausage, bread and gherkins.