Prepare all ingredients by washing and chopping as needed.

Peel the grapefruit and segment it, removing all the bitter white pith.

Cook the pasta according to package instructions and set aside.

Cook the bacon in a pan until crispy, then chop into small pieces.

Prepare the dressing by mixing olive oil, minced garlic, black pepper, lemon juice, sugar, vinegar, and soy sauce.

In a large bowl, combine the cooked pasta, grapefruit segments, sliced onion, diced tomato, bacon, and any additional vegetables or cheese.