Step 1   Cut zucchini into 1cm thick slices. Cut red onion into 1cm squares and remove excess dirt from mushrooms. Remove seeds and inner membrane from red pepper and cut to same size as the red onion. Finely chop onion and garlic for the grilling sauce

Step 2   Heat oil and saute garlic and onion over low heat. Saute until onion is slightly opaque, then add remaining ingredients and simmer for approximately 10mins or until sauce reduces

Step 3   Place beef in grilling sauce and leave to cool in the fridge for 30 mins.

Step 4   Place beef and vegetables on steel skewers and grill while basting with grilling sauce

Step 5   Season with lemon (or lime)