Roast Duck with Duck Fat Potatoes, Capers, and Parsley

Ingredients:

• 2 (5- to 6-lb.) Peking geese
• 3 teaspoons sea salt, divided
• 3 pounds fingerling potatoes, cleave in half lengthwise
• 1/4 cup chopped mild flat-leaf parsley
• 1/4 cup drained capers, chopped