Preheat BBQ grill.
To make the chilli-garlic sauce, mix chilli flakes, garlic, soy sauce, sugar and lime juice in a small saucepan, bring to a boil over medium-high heat and then set aside.
Preheat a lightly greased barbecue grill, place pork in a bowl and add ginger, lemon zest, salt & pepper. Toss to coat pork in mixture. Thread pork, shitake and button mushrooms and capsicums onto skewers. Drizzle with 1 tbs vegetable oil then BBQ, turning occasionally, for 10 minutes, until pork is just firm to touch.
Brush asparagus with remaining oil. BBQ asparagus, turning often, for 2-3 minutes or until tender. Transfer asparagus to a serving plate and top with skewers then drizzle over the sauce.