Grill the Burger patties turn it and when it's almost done turn once more and add the cheese. Pinch of mozzarella, pinch of cheddar and cover with Emmental cheese slice.

Place the burger buns at the bottom of the oven while the cheese is melting.

Time to assemble. Add Dijon mustard and ketchup on each bun.
Then burger patties, Gherkin sliced, 3 leaves of baby gem lettuce. Tomatoes slices.