noun which may take the genitive case particle 'no'
full of ingredients; hearty; substantial
Describes food, especially soups, stews, or rice dishes, that contain a generous amount of solid ingredients rather than being mostly liquid or plain.
この味噌汁は具だくさんで、野菜がたっぷり入っている。
This miso soup is full of ingredients, with plenty of vegetables.
今日の弁当は具だくさんの混ぜご飯だ。
Today's bento is a mixed rice dish with lots of ingredients.
Compound of 具 (gu, 'ingredient') and だくさん (dakusan, 'a lot, plenty'). The だくさん part is a colloquial variant of たくさん (takusan).