Soak cashews in a bowl of water for a few hours or over night. Drain and rinse.
Add the cashews and all other dressing ingredients into a high-speed blender, and blend on high until the dressing is super smooth.
For the Salads:
Clean and prepare the romaine and kale. Remove the kale stems and discard. Shred leaves into bite size pieces. Repeat with the romaine.
Heat grill to high heat and soak skewers in water.
Grill the steak for 8 minutes per side, or until medium. Remove from grill and let sit for 10 minutes covered with aluminum foil while shrimp cooks.
Thread shrimp on skewers and grill for 3 minutes per side until cooked through.
Toss the kale and romaine in the caesar dressing. Add the croutons and toss once more. Slice steak into strips and place on top of greens topped with a shrimp skewer.