Heat a large skillet over medium-high. Swirl in oil, then
add garlic and fava beans and season with salt. Cook,
stirring frequently, until garlic is softened, 2 minutes.
Remove from heat. Transfer beans to a plate with a slotted
spoon. Let skillet cool slightly, then whisk lemon juice
into oil in skillet; season with salt and pepper. (Add
more oil if dressing is too tart.) Add asparagus; toss to
coat with dressing.