I believe using a Pasture and a Coop on your house would serve for much better meals rather than having to walk to a farmland where there are cows and cows. So first of all, there's a pursuit to do. It is called Beef Thief (lol). So you have to RS gold speak to Sarah, a person residing in the farm south of Falador. She'll tell you that one of her milk cows is currently missing. She'll tell you that the thief took it to the west. Sarah will even tell you the individual was dressed in dark robes. Say you'll help.
Then you go outside. You'll see the burglar dropped something. Pick it up, and you'll see it's a runestone using engravings in another language. Go back to Sarah and give her the rock. She will say the Black Wizards utilize these runestones as strategies. Go to the Dark Wizards tower. When you arrive there will be a cutscene with the Dark Wizards speaking with the Dairy Cow in the corner of the room. The Darr Wizards state they're likely to kill the buy OSRS gold king by giving him poisoned milk.