Set aside 1 tsp (5 mL) of lemon juice for the avocado. Mix remaining juice with lemon zest, miso paste, mustard, honey, and canola oil in a blender to make the dressing. Mash avocado with a fork. Season with 1 tsp (5 mL) lemon juice, salt, and pepper.
Mix about 1/4 cup (60 mL) dressing into the crab meat and taste, adjusting as needed. Refrigerate the remaining dressing for up to two weeks — it works great on salads.
To serve, put crab meat mixture into the wonton shells so they are bursting. Spoon the avocado mixture onto a plate and place assembled tacos on top. Garnish with radish slices and sprouts.