Aha - attributed to Burns, and certainly spoken by him at a Dinner in Selkirk (hence, "The Selkirk Grace") but questionable whether he actually wrote it. Having said that, it works for me as well (especially when you get about a nanosecond's warning that you are saying Grace and it's not an RLC function).
Robert Burns did write this:
A Grace Before Dinner
O thou who kindly dost provide
For every creature's want!
We bless Thee, God of Nature wide,
For all Thy goodness lent:
And if it please Thee, Heavenly Guide,
May never worse be sent;
But, whether granted, or denied,
Lord, bless us with content. Amen!
He also wrote :
A Grace After Dinner
O thou, in whom we live and move-
Who made the sea and shore;
Thy goodness constantly we prove,
And grateful would adore;
And, if it please Thee, Power above!
Still grant us, with such store,
The friend we trust, the fair we love-
And we desire no more. Amen!
Personally, I find it much easier to make sure no-one forgot to invite the Padre. Then it's his problem to worry about Grace. And leaves the rest of us free to "entertain" Mr. Vice.
I think the word "eat" should be replaced by "receive". However, the definative version is in Corps Instructions and, most Messes include it as an annexe to Mess Rules. If not, then it's certainly worth putting in there.