In a 5-1/2- to 6-quart Dutch oven, melt butter over medium heat. Add cumin, turmeric, and cinnamon; cook and stir for 1 minute. Add leeks; cook for 2 minutes, stirring to coat with spices. Add the squash cubes and chicken broth. Bring to boiling; reduce heat. Cover and simmer for 20 minutes.
Add cabbage and orzo. Return to boiling; reduce heat. Cover and simmer for 8 to 10 minutes more or until orzo and squash are tender. Season to taste with salt and pepper. Makes 10 to 12 side-dish servings.