Minced Beef and Olive Salteñas

Name: Minced Beef and Olive Salteñas
Ingredients: 1 lb ground beef (minced beef) (Preferably grass-fed for robust flavor); 2 tbsp olive oil (Extra virgin is best); 1 large onion (finely chopped); 3 cloves garlic (minced); 1 tsp cumin (ground); 1 tsp paprika; 1/4 tsp cayenne pepper (ground, adjust for heat preference); 1 cup green olives (pitted, chopped); 1/2 cup beef stock (beef broth or beef bouillon); 2 tbsp gelatin (unsweetened); 3 cups all purpose flour (plain flour Australia and UK) (plus extra for dusting); 1/2 tsp salt; 1/2 cup unsalted butter (cold, cut into cubes); 2 large eggs (beaten, divided); 1/4 cup water (iced)