Kosher salt & freshly cracked black pepper, to taste
DIRECTIONS:
Using a large pot of salted cold water, boil potatoes until fork tender. Remove with a wire spider to a sheet pan to cool.
Boil green beans in the salty potato water for 3 - 4 minutes and drain. The green beans should be tender. Run the green beans under cold water or in an ice bath to cool them down.
In a bowl, whisk together red onion, garlic, basil, parsley, lemon, mustard and vinegar. Slowly drizzle olive oil into bowl while whisking to emulsify the vinaigrette. Season with salt and pepper.
Toss warm potatoes, green beans, mozzarella and tomatoes in vinaigrette. Taste for seasoning and top with parmesan.