Into a large pot, add the ketchup and dip the meat in this ketchup, making sure it is completely covered.
Next, cover the pot, take it to a preheated oven at 200° C (400° F) and let it bake for 30 minutes.
If you prefer, use a baking tray to do this process and cover it with aluminum foil.
After this time has passed, remove the meat from the ketchup, season it with a pinch of salt, a pinch of black pepper and a pinch of chimichurri.
Flip the beef steak and repeat the same seasoning on the other side.
In a large skillet over medium to low heat add the unsalted butter, the peeled garlic cloves, the sprig of rosemary and stir until the butter is completely melted.
Add the beef steak we prepared and fry it until both sides are golden brown.
Serve.