Trim excess fat and silverskin off of your beef, then dice into 4 cm cubes. Place in an airtight container or ziplock bag and add your marinade, and your black pepper. Save the salt until right before you grill.
2. Slice your vegetables into all the same size, keep the mushrooms whole, and cut your pineapple into 4 cm chunks.
3. Keep each ingredient in a separate bowl - makes it easier for assembly of skewers.
4. Toss your vegetables in a bit of high smoke points oil, salt and pepper.
5. Assemble skewers - Normally I do separate skewers for either meat or vegetables, this grants you more control with grilling. But with this skewer you want the caramelization of the pineapple’s sugars and the spice from the jalapenos to pass onto the other ingredients.
6. Grill 2 minutes per turn, 4 turns total.
7. Careful removing metal skewers, ensure you use a heat resistant glove or towel to serve them.