In a mixing bowl, combine the beef, shallots, and pickles, and mix well. Add the egg yolk, mustard, and season with salt, and pepper. After mixing, give the mixture a taste and adjust the seasonings, if needed. Stir in half the Asiago cheese. Keep the mixture chilled.
Preheat the oven to 300 degrees F.
Place the bread rounds on a large baking sheet. Brush the bread rounds with oil and season with salt, and pepper. Toast the bread in the oven for a few minutes, until light brown.
Top each bread round with about 1 1/2 teaspoons beef mixture. Grate the cheese over the top and garnish with a sprig of mache.
This recipe was created by a contestant during a cooking competition. It has not been tested for home use.