Assam Banana Stem Curry

Ingredients

• - 1 banana stem inner pith sliced thin
• - 1 tsp mustard seeds
• - ¼ cup fresh grated coconut
• - 1 green chilli
• - ½ tsp turmeric
• - 1 tbsp mustard oil
• - Salt
• - Lemon juice

Method

1. About Assam Banana Stem Curry: Banana stem (the inner pith of the banana plant trunk, called bhim kol baat or kola gaas in Assamese) is highly prized in Assamese cooking for its high fibre content, mild slightly astringent flavour, and probiotic-friendly properties. It is regularly eaten by elders, diabetics and pregnant women for its health benefits. The curry uses minimal ingredients to let the unique stem flavour shine through.
2. Source banana stem: Banana stem is sold at Indian groceries with a Northeast Indian or Bengali section, and at specialty Asian markets. It looks like a long pale-cream cylinder, usually pre-cut into 30-50cm sections. Choose firm, fresh-looking pieces with no slimy patches.
3. The outer-layer technique: Banana stem has multiple layers like an onion. The outermost layers are tough and fibrous and need to be discarded — the tender inner pith is what you cook with.
4. Peel down to the tender pith: Place the banana stem on a chopping board. Use a sharp knife to cut off the top inch (often dried out). Then peel away the outer layers one by one, like peeling string off a leek, until you reach the white tender pith. You will discard about half the original weight — that is normal.
5. Check the pith: The tender pith should look pale white-cream, smooth, and slightly fibrous. If you see dark spots, fibrous strings or sponginess, peel one more layer.
6. Slice the pith very thin: Slice the tender pith into 3-4mm thick rounds, then cut each round into smaller pieces (quarters or eighths). Thin slicing is essential — banana stem is fibrous and only thin pieces cook through properly.
7. The critical fibre-removal: As you slice, you will notice thin fibrous threads that connect the pieces. Use a fork tine or your fingertip to wind these out. This step is essential — the threads taste unpleasantly fibrous in the cooked dish if left in.
8. The lemon-water soak: As you slice, drop the pieces into a bowl of cold water with 1 tbsp lemon juice. Banana stem oxidises and turns dark grey within minutes if exposed to air; the lemon water keeps it pale and fresh-looking.
9. Drain just before cooking: Once all the stem is sliced and cleaned, drain in a colander. Squeeze gently to remove excess moisture. Wet banana stem dilutes the curry and stops it absorbing flavour.
10. Prepare the green chilli: Take 1 fresh green chilli. Slit lengthwise and chop into small pieces.
11. Prepare the coconut: Use 1/4 cup of fresh grated coconut. Frozen grated coconut (thawed) works as a substitute. Avoid desiccated coconut — too dry for this dish.
12. Use a wide pan: Use a wide kadhai or heavy frying pan. The stem needs to spread in a thin layer to dry-fry evenly — crowded stem steams in its own moisture.
13. Heat the mustard oil correctly: Pour 1 tbsp mustard oil into the pan over medium-high heat. Heat for 30-45 seconds until just smoking, to remove the raw bitter edge.
14. Temper with mustard seeds: Reduce heat to medium-high. Add 1 tsp mustard seeds. Within 5-10 seconds they will start popping vigorously. Have a splatter screen handy. Wait until the popping slows down, about 20 seconds.
15. Add the green chilli: Add the chopped green chilli. Stir for 15 seconds.
16. Add the banana stem: Add the drained banana stem pieces to the pan. Stir to coat with the spiced oil.
17. Add turmeric: Sprinkle 1/2 tsp turmeric powder over the stem. Stir for 30 seconds — turmeric burns quickly so move on. The pieces will turn a beautiful pale yellow.
18. Add salt: Add salt to taste — about 1/2 tsp. Stir well.
19. The critical stir-fry: Continue stir-frying on medium heat for 8 minutes, stirring every minute. The banana stem will gradually soften and start releasing a small amount of moisture. Use a flat spatula to scrape any sticking bits from the bottom of the pan and stir back in — they add flavour.
20. The doneness test: After 8 minutes, taste a piece. It should be tender but still have a gentle bite — not mushy and not still crunchy. If still crunchy, stir-fry 2-3 more minutes.
21. Add the coconut: Add the 1/4 cup grated coconut to the pan. Toss gently with the stem for 2 minutes. The coconut will absorb the flavours and add a sweet richness that balances the slightly astringent stem.
22. Final seasoning: Taste again. Adjust salt or chilli to your liking. The dish should taste mildly sweet from the coconut, gently astringent from the stem, with the mustard seeds providing little popping bursts of pungency.
23. The critical lemon timing: Switch off the heat. Take the pan off the burner. Squeeze in the juice of half a fresh lemon — about 1 tbsp. Adding lemon juice off-heat keeps the bright fresh aroma.
24. Fold gently and serve: Use a flat spoon to fold the lemon through the curry. Serve at room temperature or warm — banana stem curry actually tastes better slightly cooled, when the flavours have settled.
25. Garnish: Sprinkle 1 tbsp finely chopped fresh coriander over the top. Some Assamese homes also add a final 1/2 tsp drizzle of raw mustard oil for extra pungent character — optional but excellent.
26. Serve as a side dish: Banana Stem Curry is traditionally served as a side dish — a small portion (about 1/2 cup per person) eaten alongside steamed rice and a heartier curry like fish or pork. Its mild flavour is meant to complement, not compete.
27. A health note: Banana stem is famous in Ayurveda and Assamese folk medicine for kidney health, blood sugar control, and digestive support. Eating it regularly (1-2 times a week) is associated with better hydration and gut health. The Assamese tradition of feeding banana stem curry to convalescents and pregnant women is medically well-founded.
28. Leftover storage: Stored in the fridge in an airtight container, the curry keeps for 2-3 days. The stem absorbs flavour overnight and tastes even better the next day. Bring to room temperature before serving rather than reheating, which can make the stem soggy.