In fine sieve, rinse quinoa under cold water; drain. In saucepan, bring quinoa, broth and 1-1/2 cups (375 mL) water to boil. Reduce heat; simmer, covered, for 15 minutes. Drain in fine sieve; let cool completely in sieve.

Meanwhile, in skillet, heat 1 tbsp (15 mL) of the oil over medium heat; fry onion, garlic, salt and pepper, stirring occasionally, until onion is softened, about 4 minutes. Add spinach; cook, stirring, until wilted and no liquid remains, about 3 minutes. Let cool; coarsely chop.

In large bowl, whisk together eggs, Parmesan cheese, flour, baking powder and lemon rind; fold in quinoa and spinach mixture. Cover and refrigerate for at least an hour to let the mixture thicken.

With wet hands (trust me on this one), form into cakes (16 -24 for appie size, 12 for main course, burger sized); transfer to waxed paper–lined tray. At this point you can refrigerate before you are ready to fry

In nonstick skillet, heat the remaining oil over medium-high heat; fry half of the cakes, turning once with 2 spatulas, until golden, about 8 minutes. You can use more oil if you are not concerned with fat.

Keep warm on baking sheet in 200°F (100°C) oven. Repeat with remaining oil and cakes. Serve drizzled with Lemon Yogurt Sauce and sprinkle with sesame seeds.