noun
daikon trimmings; radish greens added to rice
Culinary term for leftover bits of daikon or similar root vegetables, often mixed into rice. Regional or home-cooking usage.
祖母は大根葉を刻んでご飯に混ぜてくれた。
My grandmother chopped up daikon trimmings and mixed them into the rice for me.
大根 is the whole daikon radish; 大根葉 refers specifically to the leafy trimmings or greens.
Compound of 大根 (daikon) and 葉 (leaf), with the reading おねば likely from a contraction or dialectal form of 大根葉 (おおねば).