wine and food eaten with wine
饎 centers on food and drink enjoyed together, specifically wine and the accompanying dishes. It refers to the pairing of wine with food in a shared meal or feast.
饎 combines the food radical 飠 with 喜 (joy, delight), suggesting food and drink that bring pleasure. The exact historical development is uncertain, but the character likely expresses the idea of festive or enjoyable eating and drinking.
The left side 飠 is food, and the right side 喜 is joy. Picture a joyful feast where wine and food are enjoyed together: 饎 is the perfect pairing of wine and food.
For シ, imagine a sheaf of wheat being turned into wine and bread for a joyful feast: sheaf -> シ, and the food and wine bring delight.