Remove & discard just a sliver from the stem ends of the bok choy – you want to keep the stems together. Cut each bok choy in half lengthways or quarters if they’re a little on the larger side; set aside.
Using a small knife, cut the little stem from each snow pea, removing the string from one side; set aside.
In a medium-sized saucepan, whisk together the broth & paste over high heat. Add the ginger. Bring to a boil then reduce the heat to a simmer; keep covered.
Meanwhile, heat a large wok over medium-high heat. Add the sausage & stir-fry for 2 minutes or until it’s starting to brown & get hot. Add the butter, mushrooms & pepper. Stir-fry for 2 minutes or until mushrooms are starting to soften.
Add the hoisin sauce & green onion & stir-fry for 1 minute or until onion is bright green; turn off the heat.
Add bok choy & snow peas to the broth mixture. Cook, covered, for 2 minutes or until bright green & veggies are tender-crisp.
Spoon the mushroom mixture into warmed bowl. Add bok choy & snow peas; ladle the broth into the bowls. Sprinkle with sesame seeds if you desire. Serves 3 to 4.