The Uninvited too high for the supermarket

Got the craving for some lunch,
but I ain't got nothing to munch
My mind is set on just one wish
a big ol' sandwich - tuna fish
Time to make a grocery run,
I'll walk there in the morning sun
Make a list of what I need most:
Tuna fish and bread (for toast)
And though my stomach may be empty,
I'll feed my head from the horn of plenty
Roll a joint Bob Marley style
and smoke it 'till it makes me smile
Starting off in aisle one,
fruits and veggies by the ton
Hey check it out, raddiccio!
These red leaves, man, they almost glow!
And bok choy! I've always wanted to try it,
I wonder if I have enough to buy it?
It's grown in Japan, or maybe China,
or maybe some farm in South Carolina?
Just then I hear a voice in my head:
stay focused, man, tuna