Firstly, soak a marble sized ball of tamarind in water for 30 minutes. Extract the pulp and keep aside.
Cut the Mangalore cucumber.
Remove the seeds and cut into large sized pieces.
Add this to a bowl of water.
Rinse and keep aside.
To make the masala, heat a pan.
Add few drops of oil.
Add the dry red chillies and roast for few seconds till the chillies turn crisp.
Remove and set aside.
Add udad dal and chana dal to the same pan.
Roast on low flame till they turn aromatic.
Remove and keep aside.
Now, add coriander seeds, cumin seeds, mustard seeds and methi seeds.
Roast for few seconds and keep it aside.
Allow all the roasted ingredients to cool down.
Transfer the roasted ingredients to a mixer jar.
Add chopped onion,garlic, coconut, curry leaves and ½ tsp turmeric powder.
Add ½ cup water and blend to a fine paste. Keep aside.
Heat a pan. Add chopped cucumbers, tamarind pulp, jaggery,salt and ½ tsp turmeric powder. Add 2 cups of water. Cover and cook for about 10 minutes.
Once the cucumbers are cooked, add the masala paste.
Rinse the mixer jar with ¼ cup of water and add that water.
Add salt as per taste. Mix well.
Cover and cook for few minutes.
For tempering, heat oil in a small pan.
Add mustard seeds, udad dal, one crushed,unpeeled garlic pod, dry red chillies and curry leaves.
Pour this tempering into the curry.
Serve hot with steamed rice.