Fill a pot with two inches of water and bring to a boil with a steamer basket inserted.
Place the cauliflower florets into the steamer basket, cover, and steam for 10-12 minutes until very soft.
Remove the cauliflower and add the green beans to the same steamer, cooking for about 5 minutes until they are crisp-tender and bright green.
While the beans steam, place the cooked cauliflower into a food processor or blender with the minced garlic and Greek yogurt.
Pulse the cauliflower mixture until it reaches a smooth, silky consistency, then season with a pinch of sea salt.
Heat the olive oil in a non-stick skillet over medium-high heat.
Season the salmon fillet with salt and pepper, then place it in the hot skillet skin-side down.
Sear the salmon for 4-5 minutes per side until the exterior is golden and the fish flakes easily with a fork.
Plate the seared salmon alongside the garlic cauliflower mash and steamed green beans.
Finish the dish with a squeeze of fresh lemon juice over the salmon and vegetables before serving.