place the yogurt in a large pot. set astack of five paper towels directly on the surface of the yogurt to absorb any liquid. repeat three times or until there is no liquid visible.(this step in not necessary if you are using tatal brand yogurt.)add the egg and beat it into the yogurt until it is incorporated. combinethe flour with 1/2 cup water in a small bowl, and stir to dissolve. whisk the flour mixture into the yogurt. add the salt. bring the yogurt mixture to a boil over high heat, stirring constantly. reduce the heat to low and gently add zucchini, one at a time. in a small bowl, combine the garlic with the mint, rubbing the mint between your palms to crush it. add the garlic-mint mixture to the yogurt and pick up the pot with both hands to swirl the mixture around. cook, uncovered, for 15 minuits to allow the flavors to come together.