1. Fill a large pot with water and bring to a boil. Place the crab legs in a steamer basket and set over the boiling water. Cover and steam for 5-7 minutes, until heated through.
2. In a small saucepan, melt the butter over medium heat. Add the minced garlic and cook for 1-2 minutes, until fragrant.
3. Stir in the lemon juice, salt, and black pepper. Remove from heat.
4. Serve the crab legs with the garlic butter sauce on the side for dipping.