Add turmeric and fenugreek; cook for 15 seconds, stirring constantly.
Remove mixture from pan; let stand 5 minutes.
Place in a spice or coffee grinder; process until finely ground.
Heat oil in a Dutch oven over medium-high heat.
Add onions, shallots, ginger, and garlic; saut 1 1/2 minutes.
Add pork; saut 3 minutes.
Add sweet potato; cook 1 minute, stirring frequently. Stir in broth; bring to a boil. Stir in ground rice mixture; cover, reduce heat, and simmer 15 minutes or until sweet potato is tender. Stir in lime juice, salt, and pepper.