Shepherd's Pie

INGREDIENTS

3 tbsp

olive oil, divided

6 oz

slab bacon, cut into ½-inch pieces

2 lb

ground lamb or beef

Kosher salt

medium onions, finely chopped

small fennel bulb, finely chopped

large carrot, finely chopped

celery stalks, finely chopped

2 tbsp

tomato paste

1 tbsp

all-purpose flour

1 cup

dry red wine

2 cups

low-sodium chicken broth

1 tbsp

finely chopped rosemary

1 tbsp

thyme leaves

3 lb

Yukon Gold potatoes

Kosher salt

1 cup

half-and-half or whole milk

1/2 cup

unsalted butter

large egg yolks

1/2 cup

sour cream

Freshly ground black pepper

potato ricer or food mill