Preheat the oven to 450°F (230°C).
Rinse the lentils and quinoa thoroughly.
Place both into a large oven-safe skillet or casserole dish with the broth.
Bake for 45–50 minutes until the lentils are tender and most of the liquid has been absorbed.
Fluff gently with a fork.
While the grains cook, blend together the olive oil, lemon juice, garlic, salt, honey, and parsley until smooth.
Reserve half of the sauce for serving.
Arrange the salmon fillets skin-side down over the lentils and quinoa.
Add the green beans around the salmon.
Brush the salmon and vegetables with half of the lemon herb sauce.
Bake for about 10 minutes.
Broil for the final 2 minutes until the salmon develops a lightly golden top.
If needed, turn off the oven and allow the Baked Salmon with Lentils to rest for several minutes until perfectly cooked.
Serve with the reserved lemon herb sauce and optional purple sauerkraut.