Make sure you have already cooked the beans.
Boil the pumpkin in water and cook till soft. (Drain most of the water, but keep some for use in the stew).
Then cut up the pumpkin into 1-inch chunks.
Chop up the leeks into small pieces.
Chop up the broccoli into small pieces too.
Sauté the leek in oil until softened, 3 to 5 minutes.
Add the cumin, coriander, cardamom and ginger, cook, stirring, 1 minute.
Add the pumpkin and broccoli and simmer, uncovered, stirring occasionally for 25 to 30 minutes.
Add the cooked beans to the pot and cook till hot.
Season the stew with salt.
Now enjoy a warm bowl of pumpkin stew this fall.