meal, eat
飡 centers on the act of eating or a meal itself. It is a rare character whose core idea is consuming food.
飡 is a rare character combining 冫 (ice) and 食 (eat). The exact historical development is uncertain, but it likely relates to eating or a meal.
The left side 冫 suggests ice, and the right side 食 means eat. Imagine a frozen meal that you eat after thawing: 飡 is a meal.
For サン, picture eating a meal under the sun: sun -> サン, and the sun warms your frozen meal.