Start by grating 4 ounces of Jarlsberg or Swiss cheese. Freshly grated cheese melts and blends better than pre-shredded varieties.
In a mixing bowl, combine the grated cheese, 2 tablespoons of real mayonnaise, and 1 tablespoon of finely chopped red onion.
Using a spatula, mix the ingredients until they are well combined and smooth. Ensure the onion is evenly distributed throughout the cheese mixture.
For the best flavor, cover the bowl with plastic wrap and refrigerate the dip for at least 30 minutes. This allows the flavors to meld beautifully.
Transfer the chilled dip to a serving dish and enjoy it with crackers, fresh veggies, or even sliced baguette.
