Place yuca in a large pot with 1 teaspoon salt and cover with water. Bring to a boil and cook for 20 minutes or until just tender. Do not overcook or it will get slimy/mushy. When cooked, let sit in the warm water until ready to serve.
Meanwhile, make Mojo sauce.
Heat a small skillet over medium heat and add the olive oil.
Add garlic, onion, and remaining teaspoon salt and cook until onion is softened, about 2 minutes. Turn off heat and whisk in the juice of one lemon.