Preheat oven to 356F/180C.
In a large bowl mix together cooked quinoa, steamed flaked salmon fillets, lemon zest and juice, 2 beaten egg whites and dill. Combine well and season with salt and pepper.
Shape the mixture into burger-style patties and arrange on a baking tray covered with parchment paper.
Transfer in the freezer to set for 10 min, or in the fridge for a couple of hours or overnight.
Arrange flour and breadcrumbs into 2 separate plates.
Dust evenly with flour each fishcake, then brush with beaten egg white and coat with breadcrumbs.
Heat a cast iron skillet over medium heat. Drizzle with a little olive oil and sear the fishcakes 2 min on both sides.
Finish to cook in the oven for 10 min or until crispy & golden and cooked through.
Serve piping hot or allow to cool and refrigerate in an airtight container for up to 2 days.
For the yogurt dip: combine all ingredients together, season to taste. Refrigerate until ready to serve with the fishcakes.