Heat a pot over medium heat. Add the ground beef and cook until the meat has just browned.
Add the onions and garlic to the beef, then cook until the onions are transparent.
Add the flour and stir. The beef will start to thicken with the oils released from the beef and become dry and crumbly.
Add the ketchup, Worcestershire sauce, beef powder, and water. Stir while bringing to a boil.
Once boiling simmer for two minutes then put aside until needed.
Sandwich
Place a slice of bread in the pie iron and slightly push down to make a dent in the bread the same shape as the pie iron so there is a spot to hold the meat filling.
Ladle or spoon in the meat sauce to fill then top with the second slice of bread. Close the pie iron and clasp closed.
Place over the coals of the campfire and cook, swapping sides to heat the inside and toast the outside, for about 10 minutes.