Heat oil in a skillet; add in onion; saute/stir until golden; stir in the tomatoes and garlic; set aside.
Meanwhile, cook farfalle in plenty of boiling salted water 3 minutes; add in the lima beans; cook until the pasta is al dente and the lima beans are tender, about 8 minutes; drain.
Toss the oil mixture and the pasta mixture together until blended; sprinkle with black pepper (and salt, if needed).