Bring 8 cups of water to a boil. Add salt until it tastes like the ocean.n2. Cook the gnooda pasta according to package instructions (approx. 5-7 mins). Drain and cool.n3. In a large bowl, combine chopped tomatoes, cucumber, onion, olives, and feta.n4. Add in the cooled pasta. Mix in mayonnaise, olive oil, red wine vinegar, Dijon mustard, and oregano. Toss gently.n5. Season with salt and black pepper to taste. Chill for at least an hour before serving for optimal flavors.