To make pita crisps, cut bread into small triangles. Brush both sides of triangles with combined oil and garlic. Place on a large baking tray in a single layer. Bake in 180 °C oven (fan-forced) for 7-8 minutes or until crisp and light golden. Remove. Cool on trays.
Heat a lightly oiled, large, non-stick frying over a high heat. Add mince, onion and garlic. Cook for 8-10 minutes, using a wooden spoon to break up mince, until browned all over. Add oregano, allspice and tomato paste. Stir over heat a further minute.
Stir in 1½ cups water and stock cube. Bring to the boil. Reduce heat, simmer uncovered for 5 minutes. Stir in zucchini and beans. Simmer for a further 5-8 minutes, or until thick.
Combine yoghurt with cucumber and mint in a small bowl.
Divide pita crisps and mince mixture between 4 shallow bowls. Serve topped with yoghurt and tomatoes. Garnish with mint leaves, if desired.