In a large zip tight baggie combine the chopped shallot, red wine, horseradish, dry mustard and steak. Squish and smush to coat. Refrigerate overnight.
***If you're using bamboo(wood) skewers soak for 30 minutes prior to using****
Rough, large chop the mushrooms,onion, jalapeno, and bell peppers so that they'll fit on the skewers without splitting. There's no science to this - it's just a quick, large, rough chop.
Layer the meat and veggies on the skewers until they're full.
Place them on your pre-heated grill and cook - turning 2 or 3 times to fully cook.
The amount of time they cook is up to you.
We like our meat Medium- Rare - so I turned them 3 times (5 minutes each side)