Make the gondi mixture: Place the onions into a food processor with an “S” blade. Pulse about 10 times until the onion is finely ground. If you're using whole chicken breasts, add the chicken and blitz until finely ground. If using ground chicken, pulse a few times until the chicken is incorporated with the onions. Add the turkey and pulse until combined, about 10 times. Add the chickpea flour, oil, salt, pepper, cardamom, water, and turmeric to the mixture. Grind until the mixture is combined and unified, about 2 minutes. The mixture should not be too dry or too wet and sticky. If it is, add chickpea flour and/or water 1 teaspoon at a time to get the right consistency. Put the mixture in a bowl, cover with plastic wrap, and refridgerate for 2 hours.