Firstly boil water and add pasta to it and cook it till is done.Sieve the water.Drain well and transfer to a large bowl.
Meanwhile, in a nonstick pan, add olive oil, garlic, onion and veggies saute for about 2 minutes, stirring occasionally. Then add grapes and saute for 1 minute.
Add salt, red chilli powder and pepper to it and saute.
When done, add pasta to cooked mixture and toss to coat well.Season with oregano, sesame seeds and green onions.