Fire up the BBQ and toss the sausages and red pepper on the grill (the pepper should be quartered and lightly drizzled with olive oil and sprinkled with salt and pepper). The sausages and pepper should take about 20 minutes depending on your grill. Set aside.
Bring a large pot of water to boil, add a dash of salt and your vermicelli (cook for 10-12 minutes, until al dente).
While the sausages and pasta cook, in a small saucepan, saute the red onion and green beans in olive oil until tender.
Drain the pasta and toss everything back into the pasta pot-- olive oil, lemon juice, basil, sausages (sliced!), red pepper, red onion, green beans, parmesan, and salt and pepper to taste. Toss gently to combine.