Peanut butter and honey sandwich. Carbs, some protein, some fat. Easy to make, cut it up and put it in a ziploc to carry with.
Of course, then you'll get peanut butter all over your bike because in your nice warm jersey pocket it oozes out of the sandwich and gets everywhere.
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"Don't take life so serious-it ain't nohow permanent."
"Everybody's gotta be somewhere." - Eccles