I loooove langka. I especially like in a langka-luya smoothie! (Thanks to Asha Peri for introducing me to do this!). Here is a variation of langka-luya that you can use if you are out of gata :D
Try this recipe and let me know how you like/don't like it. Reviews welcome!
1-2 cups fresh carrot juice
2-3 cups langka, seeded
1 T fresh turmeric
1 T fresh ginger
Just blend everything in a high-speed blender. Experiment with putting in big pieces of unjuiced carrot :D
For regular blenders - Put in the carrot juice and add the langka pieces little by little. Chop the turmeric and ginger before adding them in.