Prepare the fillings: julienne carrot and cucumber; slice pork roll into medium strips; halve the cooked prawns.
Soak rice vermicelli in boiling water for 3 minutes. Drain through a sieve, rinse under cold water, and set aside.
Fill a large bowl or pan with cold water big enough to soak a sheet of rice paper. Place a damp tea towel on your chopping board.
Dip one sheet of rice paper into the cold water until fully wet. Place it on the damp tea towel.
Layer the rice paper with a few leaves of coriander, mint, carrot, cucumber, edible flowers, prawns, pork roll, and some vermicelli.
Fold the rice paper sides over the filling, fold the bottom up, then roll forward tightly to seal. Repeat until all filling is used.
Place finished rolls on a bed of lettuce so they do not stick. Garnish with edible flowers.
To make the sweet chilli sauce: mix rice vinegar, sweet chilli sauce, lime juice, and fish sauce in a small bowl. Adjust to taste.
To make the peanut sauce: combine peanut butter and hoisin into a paste, then add soy sauce, vinegar, and sugar. Gradually add warm water to combine. Stir in crushed peanuts.
Serve the summer rolls with the dipping sauces immediately.