Lotus stem

Kamal Kakdi

Measured by weight in grams; no spoon or piece conversion needed.

Instead of Lotus stem

Lotus root
Use the same weight; same vegetable under another name; peel and slice; cooking time unchanged.
Water chestnut
Use the same weight, sliced; add 5 minutes before the end; crisp but less starchy and no holes.
Canned bamboo shoots
Use the same weight, drained and sliced; add 5 minutes before the end; crunchier and more sour.