In a large skillet, heat 1 tablespoon oil over medium heat. Add onion and cook about 4 minutes, stirring occasionally, until soft. Stir in beef, parsley, curry powder, garlic, salt and pepper, and cook about 5 minutes, stirring to break up lumps, until meat is no longer pink. Taste and add more curry powder if you want.
Transfer meat mixture to medium bowl and cool to room temperature. Wipe out skillet.
Line baking sheet with parchment paper. Cut each egg roll wrapper in half diagonally. Working with one triangle at a time, lightly brush edges of wrapper with water. Fold long side of triangle in half, pinching edge to seal and form a little cup.
Place generous tablespoon of meat mixture into cup, then pull open flap of wrapper over cup, pressing to seal. As each sambusa is finished, place it on baking sheet. When sheet is full, cover sambusas with another piece of parchment paper and continue layering with finished sambusas.
Line a platter with several layers of paper towels. In skillet, heat about 1 inch of oil until a deep-frying thermometer reads 365 to 375 degrees, or a pinch of flour bubbles and sizzles in the oil. Add half of sambusas to the oil and cook for 2 to 4 minutes, turning once, until golden brown on both sides. Using tongs or a skimmer, transfer sambusas to paper-towel-lined platter to drain briefly. Repeat with remaining sambusas and serve.