From GameWatcher: “Bloodstained: Ritual of the Night has got Garlic, but not in sufficient quantities to stave off vampire attacks, sadly. There’s enough to sprinkle some on foodstuffs, though, and we’ll help you find Garlic in Bloodstained.
Since the game features a curiously prominent cooking system, you’d expect something as common as simple garlic to be available in large numbers, but this isn’t the case. Here, you’ll learn how to farm Garlic in this wonderfully weird Metroidvania.”
Source: N4G PC Bloodstained Ritual of the Night Garlic – Where to find it?