Here in South Africa, Indians refer to any non-seasoning herb with the suffix Bhaji whether it be amaranth leaves,spinach, fenugreek leaves, mustard greens, radish greens, beetroot leaves, drumstick tree leaves, watercress or pumpkin vine leaves. Its simple and delicious to throw any of these together. Just remember to chop the herbs finely. For drumstick tree leaf, you will have to boil the leaves for an hour or so before cooking, you will have to remove the stringy and hairy bits from the pumpkin leaves before cooking (but worth the effort)and derib the spinach/beetroot leaves. The younger the leaves the better they taste.