Kittencal's Greek Salad

Name: Kittencal's Greek Salad
Cuisine: European, Mediterranean, Greek
Ingredients: 1 cup oil (extra-virgin olive oil); 1 to 2 whole lemons (juice of 1 to 2 lemons, no bottled for this, if you like your dressing lemony then use 2 small lemons); 1 teaspoon mustard (Dijon mustard); 2 teaspoons red wine vinegar; 2 to 4 teaspoons dried oregano (preferably Greek oregano); 1 teaspoon dried basil; 2 garlic cloves, minced; 1/2 teaspoons salt, or to taste; 1/2 teaspoon freshly ground black pepper; 1 teaspoon sugar; 1 romaine lettuce (outer leaves removed); 2 tomatoes, large (firm ripe Roma tomatoes, chopped); 1 cucumber (English, peeled, seeded and chopped); 1 onion (medium red onion, sliced); 1 bell pepper, green (seeded and chopped or sliced); 1/2 pound feta cheese (crumbled or diced); 1 cup olives, kalamata