In a small bowl, combine the minced garlic, finely chopped parsley, lemon zest, and half of the lemon juice to create the fresh gremolata.
Pat the butterflied sardines dry with a paper towel and season both sides evenly with sea salt and black pepper.
Heat the extra virgin olive oil in a large stainless steel skillet over medium-high heat until the oil is shimmering.
Carefully place the sardines in the skillet, skin-side down, and sear for 2-3 minutes until the skin is golden and crispy.
Using a thin spatula, flip the sardines and cook for just 60 seconds more until the flesh is opaque and tender.
Steam the green beans for 3-4 minutes until they are bright green and tender-crisp.
Plate the warm quinoa and steamed green beans, then arrange the seared sardines on top.
Finish the dish by spooning the lemon-herb gremolata over the fish and drizzling with the remaining lemon juice.