In his own words · Concentration
“You don't need all this damn diversification. You're lucky if you've got four good assets. … If you're trying to do better than average, you're lucky if you have four things to buy. And to ask for 20 is really asking for egg in your beer.”
— Charlie Munger · Daily Journal Corporation Annual Meeting (February 16, 2022) · 2022
As recalled from Daily Journal Corporation Annual Meeting (February 16, 2022) · 2022 — the sense is right but the wording is not verbatim.
Condensed from a longer answer (the ellipsis marks an omitted jab at finance professors); 'egg in your beer' is an old idiom for wanting more than you deserve.