Spinach Pasta Salad

Bahan-bahan (8 porsi)

• 8 ounces bowtie pasta
• 1/2 very small red onion (thinly sliced and cut into 1-inch pieces, about 1/4 cup)
• 3 large cloves garlic (minced)
• 6 tablespoons olive oil
• 1/4 cup red wine vinegar
• 1 teaspoon kosher salt
• 1 teaspoon freshly ground black pepper
• 4 cups baby spinach
• 2 cups grape tomatoes (halved)
• grated fresh Parmesan (optional)