In a large skillet, heat a little oil over a medium-high heat. Add the ground beef and cook until it starts to brown.
Add paprika, cayenne pepper, cumin, salt, and Worcestershire sauce (if using) to the ground beef. Stir well to combine.
Stir in the tomato paste and cook for an additional 2-3 minutes, allowing the flavours to meld together.
Stir in the sour cream if using.
Warm the tortillas on the stove or in the microwave to prevent them from breaking.
Place a spoonful of the beef filling onto each tortilla, add a little shredded cheese and fold in half.
Optional: To prevent the tacos from opening during frying, secure them with toothpicks/cocktail sticks, piercing through the open edge.
Heat a large skillet over medium-high heat, add enough neutral oil to cover the bottom by about ½ inch.
Carefully place the tacos in the hot oil using tongs.
Fry the tacos for about 2-3 minutes on each side or until they turn golden brown and crispy.
Carefully remove the fried tacos from the pan and place them on a plate lined with paper towels to drain excess oil.
Remove the toothpicks from the tacos. Serve your fried tacos with optional toppings like lettuce, additional sour cream, and guacamole.