Take a large pot and fill it with lightly salted water then, boil it till the water starts rolling over high heat. After the water is boiled, stir in penne pasta and boil it again. Sauté this pasta without covering the pot as you need to stir it occasionally until al dente. This process will take about 11 minutes after which you will rinse the pasta under cold water and then drain it well in the sink with the help of a colander set.
Now whisk the lemon juice, vinegar, oregano, garlic, olive oil, salt and pepper together and then leave them aside. After that take a large bowl and combine tomatoes, green and red pepper, onion, olives, cucumber along with feta cheese in it. Then, pour dressing over this mixture of pasta and other ingredients and mix it well. After mixing cover this large bowl and refrigerate it for about 3 hours before it is ready to be served.