Caesar: Add oil, mayo, mustard, lemon juice, and garlic to a blender. Blitz just until combined - do not over blend, which can cause the sauce to break.
Beans: Drain and rinse beans. Stir in the Caesar dressing, parmesan, and black pepper.
Serve: Toast slices of sourdough and spoon Caesar beans on top. Serve immediately.
Optional Level Up: You can optionally place the prepared toast under the oven broiler very briefly to toast the top and make the cheese melty!
