Step 1

Add the kale, Romaine, croutons, Parmesan, dressing, and tomatoes (if using) to a large bowl.  Toss until combined.

Step 2

Serve immediately.

Step 3

Add all ingredients except milk to a small mixing bowl, and whisk together until combined and smooth.  Whisk in a tablespoon of milk at a time until the dressing reaches your desired consistency.

Step 4

Use immediately, or refrigerate in a sealed container for up to 3 days.