Boiling the broccoli rabe beforehand reduces its bitterness. Toss in the pan with sauteed garlic and almonds to reheat.
Bring a large pot of salted water to a boil. Working in batches, add broccoli rabe to water and cook until water returns to a boil. With a slotted spoon, transfer to a colander to drain. In a large skillet, heat oil over medium. Add garlic and almonds; cook just until beginning to turn golden, about 5 minutes. Add broccoli rabe and toss to combine. Season to taste with salt and pepper. Serve warm or at room temperature.