No, not that holy trinity, I'm talkin' 'bout the one they worship in N'orleans, minced onion, bell peppers, and celery, cooked in fat, usually butter, but bacon fat or duck fat wor [..]

The Father, the son and the Holy Spirit (ghost). The division of a unified monotheistic conception of God into three. The potent symbolism of three made this number a common element in Catholic art and architecture. 

a staple of most Cajun dishes such as gumbo, jambalaya and étouffée, it’s a base of diced onions, celery and bell pepper which is then sauteed with oil. The Holy Trinity is a reference to the strong R [..]

(Christianity) The three persons of the Godhead: the Father, Son and Holy Spirit (US,informal) Three prestigious colleges in the US: Harvard, Yale, and Princeton (US,informal) celery, bell peppe [..]