Prep the ingredients per the instructions above.
Mix the water and cucumber. Refrigerate until service.
Squeeze meat from sausage casing, and roll into small meatballs, about golf ball-sized. Heat the oil in an oven safe saute pan over medium-high heat. Cook meatballs, turning, until browned all over.
Add the onion and garlic. Cook, stirring, for 2 minutes or until softened. Add the chickpeas and olives. Cook, stirring, for 2 minutes. Add tomatoes and vinegar. Reduce heat to medium.
Simmer, covered, for 10 minutes or until meatballs are cooked through. Season. Stir in the kale. Simmer, covered, for 1-2 minutes or until just wilted.
Heat a nonstick pan on medium heat. Warm the pita on both sides. Cut into wedges.
Serve the casserole with pita and cucumber water.