"Grinds into" is a commonly used phrase, but there are also many synonyms that can be used to convey the same idea. Here are some options: crushes, pulverizes, mashes, grates, minces, purees, blends, pulverizes, liquefies, grinds up, smashes, obliterates, breaks down, reduces to powder, comminutes, macerates, frappes, turns to pulp, chops finely, processes, or whips into a froth. These words can be used interchangeably with "grinds into" depending on the context and desired effect, but they all have the same basic meaning of breaking something down into smaller pieces or changing it into a smoother or more uniform texture.