Track, don’t see “lemon” in the recipe ingredients?
You’re right, but that’s the thing. It comes from adding the garlic to the hot oil and frying. It’s not the same if you heat the garlic slowly. If you want Italian sausage with your meal, I’ll fry it in separate pan till it’s good and brown then slice it up and add over a plate of pasta and sauce. But you could also just add the sliced sausage to the sauce and cook a bit.