Hello John, It means : When you have a cheerful company , pleasantly smiling with good temper and manners ,this will make a simple meal seems like a whole lot of a feast because of the good temper and the atmosphere filled with harmony which affords pleasure equivalent to that fun and enjoyment one experiences in a big ceremonial dinner party,where the food is well prepared and greatly enjoyed.

用餐時 心情愉快 即便小菜 也是盛筵