In a large zip-top bag, combine the lemon juice, 1/2 cup olive oil, garlic, salt, pepper, cumin, paprika, oregano and red-pepper flakes. Add the salmon, zip the top of the bag and give it a quick shake to combine. Refrigerator for 2 hours.
Preheat a cast iron to medium high heat. Remove the salmon from the marinade and grill for 3-4 minutes on each side until crispy but not overcooked. Remove and set aside to rest.
For the Salad
Transfer the salmon to a large bowl and toss to combine with the quinoa, parsley, mint, cherry tomatoes and cucumbers and lemon vinaigrette. (to make the lemon vinaigrette, just whisk everything together)
Divide the shredded kale amongst 2 bowls and top with a hefty portion of the salmon tomato mixture. Drizzle with tzatziki or serve it on the side. Also pita chips on the side.