Whole grain mustard
Red pepper flakes
Sea salt & pepper
Steak (I used ribeye)
Green & red peppers
Combine all marinade ingredients and pour over steak in a large ziploc bag. Allow to refrigerate for approximately 8 hours.
Slice vegetables, pineapple and steak to large cubes which will fit onto skewer.
Brush remaining marinade over assembled skewers and place on grill.
Grill for approximately 8 minutes, turning a few times.