Preheat your oven to 400°F and line a baking sheet with parchment paper.
Dice the Japanese sweet potato into small, uniform cubes and toss them with half of the olive oil and a pinch of sea salt.
Spread the potatoes on the baking sheet and roast for 20-25 minutes until they are tender and the edges are golden brown.
While the potatoes roast, finely dice the yellow onion and grate the fresh ginger and garlic clove.
Heat the remaining olive oil in a large skillet over medium-high heat and add the diced onion, sautéing until translucent.
Add the ground turkey to the skillet, breaking it into small crumbles with a spatula, and cook until browned and fully cooked through.
Stir in the grated ginger, garlic, sea salt, and black pepper, cooking for 1-2 minutes until the aromatics are fragrant.
Add the baby spinach to the skillet and stir constantly until the leaves are just wilted.
Squeeze the fresh lemon juice over the turkey mixture and stir to incorporate all the bright flavors.
Assemble the bowl by placing the roasted sweet potatoes at the base and topping them with the savory lemon-ginger turkey mixture.