Place 2 pounds trimmed fresh green beans in a large stock pot. Cover the green beans with water 2 inches above the beans. Place on the stove over high heat, and bring to a boil. Once at a boil, lower the heat to medium and simmer for 5 minutes. Strain and set aside.
In a large bowl whisk together ⅓ cup olive oil, 3 Tablespoons red wine vinegar, 4 cloves garlic, minced, 1 Tablespoon dijon mustard, 2 ½ teaspoons kosher salt and ¼ teaspoon black pepper.
Add the warm green beans and 1 small red onion, thinly sliced, toss to coat. Cover with plastic wrap and place in the refrigerator to chill for 4 hours or longer if you can.
Before serving add 1 pint cherry tomatoes, cut in half and ¼ cup grated parmesan cheese.
Toss to combine, and serve immediately.
Notes
This salad is great cold or at room temperature.
Other ingredients can be added to this, see suggestions above.
You will want to make sure to chill for 4 hours so the the flavors can marry.