Corned Beef Hash with Poached Eggs

Ingredients:
2 cups roughly chopped boiled red-skinned potatoes
2 cups diced cooked corned beef
1/4 cup corned beef cooking liquid or chicken broth
1/2 medium yellow onion, grated
1/2 clove garlic, mashed with a fork
1 tablespoon chopped fresh flat-leaf parsley
1 tablespoon whole-grain mustard
1/4 teaspoon dried thyme
pinch nutmeg
pepper
1/4 cup plus 1 tablespoon butter