Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Dice the russet potato into 1/2-inch cubes and toss them on the baking sheet with 0.5 tbsp of the olive oil, sea salt, and black pepper.
Roast the potatoes for 20 minutes until they begin to turn golden and tender.
Move the potatoes to one side of the pan, add the trimmed green beans to the other side, and roast for an additional 10-12 minutes until the beans are crisp-tender.
While the vegetables finish roasting, heat the remaining 0.5 tbsp of olive oil in a large skillet over medium-high heat.
Add the minced garlic and red pepper flakes to the skillet, sautéing for 30 seconds until the aroma is fragrant.
Add the black tiger shrimp to the skillet and cook for 2-3 minutes per side until they are pink, opaque, and perfectly curled.
Combine the roasted potatoes and green beans into the skillet, drizzle with fresh lemon juice, and garnish with chopped parsley before serving.