Radical
Grain

Mnemonic

A comet streaks across the sky and slams into a rice paddy. The explosion scatters every grain into the air like golden confetti. Farmers watch in awe as grain rains back down, perfectly husked and ready to eat.
Additional thoughts
Picture the comet's fiery tail turning into individual grains of rice mid-air. The cosmic heat perfectly toasts each grain. Comet + rice = grain.
Quick recall
A comet blasts a rice field, launching every grain skyward like golden confetti.