i love avocados, but DH hates them, so it's just me and DS(who is 16 months and doesn't eat that much of them) who eats them. i hate throwing the unused portion out, but i can't seem to figure out how to prevent it from going brown. i tried the 'spray with pam and cover in plastic wrap' trick that i saw on Pinterest, but no dice. i see people pack them for their LO's lunch too but how do you keep it from going brown?