In a pan over medium heat, warm oil, add beef then cooké until golden brown. Add onion, potato, cumin seeds, aji panca paste, paprika and salt. Sauté until onions are soft. Add water and cook until potatoes are completely cooked. Remove from heat, season with salt and pepper to taste and cool over ice. Once completely cooled, fold in chopped hard-boiled eggs and cilantro.

Sift flour with salt into a large bowl and blend in the butter with your fingertips or a pastry blender until mixture resembles coarse meal with some (roughly pea-size) butter lumps.

Beat together egg, water, and vinegar in a small bowl. Add to flour mixture, stirring with fork until just incorporated (mixture will look shaggy).

Turn mixture out onto a lightly-floured surface and gather together, then knead gently just enough to bring dough together.

Form dough into a flat rectangle, wrap in plastic wrap and chill for at least 1 hour.
 On a floured surface, roll dough into 1/8” thickness. Cut into rounds of 4” circles.