Using a large bowl, add flour, sugar, poppy seeds, lemon zest, baking powder and salt; stir until well combined.

Using a separate medium bowl, whisk together eggs, lemon juice, buttermilk, melted butter and vanilla extract.

Pour liquid mixture into bowl with the dry ingredients; stir until just barely combined. Let mixture sit for 15 minutes.

Preheat oven to 300°F.

Preheat waffle iron according to manufacturer’s instructions.

Once heated, spray waffle iron with nonstick cooking spray.

Spoon batter into waffle iron. Let waffles cook for 4-5 minutes, or until fully cooked and golden brown in color. Transfer waffles to an oven-safe plate and place in oven to keep warm.

Repeat process with remaining batter.

Serve with whipped cream, berries and/or maple syrup.