Grain
A samurai hits the foreheads of grains with his weapon so the grains will pop off and into his mouth. He doesn't want to kill the plants, so he's just skimming the grain's foreheads so they'll fall off and he can eat them.
Picture the samurai taking out his weapon and spinning in a lightning fast circle. The forehead grains pop off and come raining into his open mouth.
こく
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Phew, all of this grain is making the samurai thirsty, so he reaches in his bag and pulls out an ice cold, refreshing Coke (こく).
These grains aren't even cooked, they're just hard and raw, so the Coke really helps wash them down.