Yam Brioche

1 pound yam
2 tablespoons butter, softened
3/4 cup milk
1/2 cup Emmenthal cheese, grated
2 eggs
salt
water

1. Boil salted water in a large pot and add yams, cooking them until tender, about 45 minutes.
2. Drain the water, peel the yams and mash them in a large bowl.
3. Preheat the oven to 400 degrees and grease a baking sheet.
4. Heat the milk over medium heat until just below the simmering point and add to the yams, along with the butter, cheese and 1 egg.
5. Separate the other egg and whisk the yolk until light and fluffy, then fold this into the yams. Season with salt.
6. Make mounds by tablespoon with the yam mixture onto the baking sheet and then top each mound with a smaller one, about a teaspoon of the mixture.
7. Lightly beat the yolk and brush the tops of the brioches.
8. Bake until browned, about 20 minutes.

Makes 12 servings