Authentic Argentinian Beef Empanadas

Name: Authentic Argentinian Beef Empanadas
Ingredients: 15 pieces empanada shells (I used “La Salteña”, find them at your local Latin grocery or make your own); 4 teaspoon Canola oil; 150 grams white onion; 250 grams ground beef (minced beef); ½ medium red pepper (red capsicum); 100 grams green onions (scallions or green shallots); 2 medium tomato; 1 cup passata or crushed tomatoes (tomato puree with seeds removed); 1 teaspoon paprika; 1 teaspoon cumin; 1 pinch salt; 1 pinch ground black pepper