Peel the sweet potato and cut into one-inch cubes.
Place sweet potato cubes in a pot of boiling water and cook for 10-12 minutes until fork-tender.
While potatoes cook, place green beans in a steamer basket over boiling water for 5-6 minutes until bright green and crisp-tender.
Pat the salmon fillet completely dry with a paper towel and season with sea salt and black pepper.
Heat avocado oil in a non-stick skillet over medium-high heat until shimmering.
Place the salmon in the pan skin-side down and press gently with a spatula for 30 seconds to ensure even contact.
Sear the salmon for 4-5 minutes without moving it to develop a crispy crust.
Flip the salmon carefully and cook for an additional 2-3 minutes until cooked to your preference.
Drain the sweet potatoes and mash them in a bowl until smooth, adding a pinch of salt if desired.
Plate the salmon alongside the sweet potato mash and green beans, finishing the entire dish with a fresh squeeze of lemon juice.