green black walnut on tree

american appetizer autumn black brown close closeup crack cracked delicious dessert detail diet dried dry eat edible foliage food fresh fruit furniture green hard hardiness hardwood harvest health healthful healthy ingredient kernel leaf leaves mature natural nature nut nutrient nutrition nutritious nuts nutshell nutty organic production protein raw ripe season seasonal seed seeds shape shell snack surface texture textured timber tree unripe walnut walnuts wood wooden yellow