1. In a large bowl, combine zucchini, onions, eggs, matzo meal, and salt and stir to combine.
2. Heat a quarter inch of extra-virgin olive oil in a large sauté pan over medium-high heat. Drop by two tablespoons of zucchini mixture and lightly press down to flatten. Fry for about four to six minutes per side or until nicely browned. Remove and drain on paper towels. Continue with remaining batter.
3. In a small bowl, combine yogurt, dill, cucumber, lemon juice, and salt and stir. Serve tzatziki alongside latkes.