Meatloaf Meatballs with Horseradish Mash and Gravy

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Meatballs:

3 tablespoons unsalted butter

1 onion, finely chopped 

2 small ribs celery, finely chopped 

3 cloves garlic, finely chopped 

Salt and pepper

Salt and pepper 

2 tablespoons fresh thyme, finely chopped 

1/4 cup dry sherry or white wine 

3 slices 1-inch-thick, good-quality white bread, crusts trimmed 

About 1 cup whole milk 

2 pounds ground sirloin 

1/4 cup chopped flat-leaf parsley 

1/4 cup Worcestershire sauce 

2 tablespoons Dijon mustard 

1 large egg plus 1 yolk, lightly beaten 

Olive oil cooking spray 

Horseradish Mash:

2 1/2 to 3 pounds russet potatoes, peeled and chunked*

Salt 

1 cup sour cream 

1/4 to 1/2 cup half-and-half or heavy cream 

3 to 4 tablespoons horseradish, to your taste 

Coarse black pepper 

1/4 to 1/3 cup chopped chives 

Gravy:

4 tablespoons (1/2 stick) unsalted butter

3 tablespoons all-purpose flour 

3 tablespoons Worcestershire sauce 

Coarse black pepper 

3 cups beef stock 

1 egg yolk, lightly beaten