Sirloin Skewers with Roasted Potatoes

1/4 cup dried fenugreek leaves 2 tablespoons ginger masala, recipe follows Pinch salt and freshly ground black pepper 1 pound sirloin steak, cut into 1 1/2-inch cubes Roasted Potatoes, recipe follows Special equipment: 4 metal or bamboo skewers that have been soaked in water overnight. Ginger Masala 2 tablespoons ground ginger 2 tablespoons ground coriander 1 teaspoon turmeric 1 teaspoon paprika 1 teaspoon ground cardamom 1 teaspoon ground fennel Roasted Potatoes 1 pound of baby red potatoes, cut in halves 5 cups water 2 tablespoons grapeseed oil 1 tablespoon chopped fresh ginger 1 teaspoon coriander seeds Pinch salt and freshly ground black pepper