A grenadier Guardsman would serve the couple “gin and orange and beef sandwiches by the open fire.”
Tonight, he will host a dinner at Buckingham Palace in his role of Colonel of the grenadier Guards.
A grenadier Guards sergeant who was among the audience told the paper, "It was really tip-top."
1670s, originally a word for soldiers "who were dexterous in flinging hand-granados" [Evelyn], from French grenadier (15c.), from Middle French grenade "grenade" (see grenade); later "the tallest and finest men in the regiment" [OED].