1. Combine the water, salt, and uncooked rice in a medium saucepan that has a lid.
2. Bring to a boil over high heat.
3. Reduce heat to low and cover.
4. When the water is absorbed, remove rice from heat and set aside.
5. The rice should take approximately 15 minutes to cook.
6. Warm your oven to 350 degrees.
7. In a saute' pan, melt butter and add mushrooms. Cook for 3 minutes or until the mushrooms are softened.
8. Pour the beef stock into the mushrooms and butter.
9. Stir in the cooked rice.
10. Grease a 7 inch ring mold and spoon the mushroom rice mixture evenly into the mold.
11. The mold should then be put in a baking pan containing hot water up to 1 inch.
12. Bake at 350 degrees for 30 minutes.
13. Carefully turn the mushroom rice ring onto a serving platter.