Wash, wipe the gourds (tendli) lengthways into six pieces. Rub salt and leave in the sun for 1 hour or 2 hour. Discard if any water is there.Grind red chilies, garlic, ginger, fenugreek seed, turmeric, peppercorn, cloves, sugar or jaggery, vinegar and salt. Ground until uniform and smooth paste is formed. Add little water if required.Combine the paste with the tendlis. Marinate them for an hour more.Heat oil in a large pan once hot add mustard seed, curry leaves and asofoetida. Once they crackle add the marinated tendlis.Cook the tendlis for five mins on low heat or cook until just about tender. Please don't overcook the tendlis.Allow to cool, once cools down store them into tight bottle jars at a cool place. Cover the pickle with the rest of oil and vinegar. Place out for 8-10 days then keep in the fridge for longer life.