「食べた ことが あります」 means "I have eaten it" or "Have eaten." This expression is used to state that you have had the experience of eating something. It is formed with the た-form of the verb (e.g., 食べる -> 食べた) followed by ことが あります. It's useful when discussing food experiences.

「食べた ことが あります」は「食べたことがある」と、過去の経験を表します。「食べる」の「た形」です。