Place sorghum and water in a pressure cooker and cook for approximately 25 minutes, until al dente.
If you don’t have a pressure cooker, cook sorghum like rice using 1 part sorghum to 3 parts water, simmering about 1 hour until al dente.
Carefully release pressure, then drain and rinse sorghum under cold water.
Transfer sorghum to a large bowl. Add garbanzo beans, celery, red onion, parsley, and cilantro, and toss to combine.
Add lime juice, lime zest, olive oil, cayenne pepper, and a pinch of sea salt.
Mix well, taste, and adjust seasoning with additional salt as needed.