In a food processor, add vegetables, herbs, minced ginger/garlic, and shrimp. Process until everything is combined and the vegetables are evenly minced. Empty mixture into a large mixing bowl.
Add lemon zest, lemon juice, truffle oil, soy sauce and salt to taste. Mix well.
Following the instructions on the packaging of your pre-made dumpling wrappers, fill each wrapper with 1 heaped tbsp of prawn& veggie dumpling filling. Brush edges of wrapper with water, seal dumpling to your desired shape (Youtube has some great tutorials!) and set aside on a lightly floured plate; cover the plate with a slightly damp cloth to avoid your dumplings drying out.
Line a bamboo steamer basket with parchment paper and arrange the dumplings on top. Heat a wok with a 1-2″ water and place the basket into the wok. Let the dumplings steam for 3-4 minutes.
For the dipping sauce, combine all ingredients in a bowl & whisk till combined. Serve with hot dumplings topped with sliced spring onions & red chillies.