For sauce, in a medium nonstick skillet, heat olive oil on medium-low heat. Sauté shallot until opaque. Add rosemary and heat until fragrant. Add 1/2 cup mushroom broth and tomato paste. Stir until tomato paste is incorporated. Turn up heat; simmer for about 5 minutes until raw tomato flavor is gone. Add soy milk creamer, plus salt and pepper, to taste. Keep warm, but do not boil. (To reheat, warm carefully over low heat. Add creamer if too thick.)