Whisk one egg white with a pinch of salt to make soft peaks. Blend one whole egg, the egg yolk, the lard, and the greaves until creamy. Mix in the diced bacon.With a spatula fold carefully the egg whites in the egg yolk mix. Spoon it in the greased muffin form. Top with a thin slice of bacon. Bake at 160 °C for about 15 minutes until golden.