Peel and cube the sweet potato, then boil in a pot of water until tender, about 12-15 minutes.
Drain the sweet potatoes and mash them until smooth, seasoning with a pinch of salt and pepper.
Pat the salmon fillet dry with a paper towel and season both sides with salt and pepper.
Heat one teaspoon of avocado oil in a non-stick skillet over medium-high heat.
Place the salmon skin-side down in the pan and sear for 4-5 minutes until the skin is crispy.
Flip the salmon and cook for another 2-3 minutes until opaque and cooked through, then remove from the pan.
In the same skillet, add the remaining teaspoon of oil and the minced garlic, sautéing for 30 seconds until fragrant.
Add the green beans to the skillet with a splash of water, covering to steam for 3-4 minutes until crisp-tender.
Plate the salmon alongside the sweet potato mash and green beans, finishing with a fresh squeeze of lemon juice.