Heat a cast iron skillet or paella pan. Add the olive oil.
3 tablespoons extra virgin olive oil
Carefully add the sofrito tomato mixture. Add the cumin and paprika. Season with a pinch of salt and freshly ground black pepper. Cook over medium flame - 10 - 12 minutes until the mixture starts to darken.
1/2 teaspoon ground cumin, 1/2 teaspoon smoked paprika, 1/8 teaspoon freshly ground black pepper
Make a clearing in the center of the sofrito. Add a couple teaspoons olive oil if necessary. Add in the brown rice and toast for a minute or two.
1 cup basmati brown rice
Season with salt. Mix to combine the rice with sofrito mixture.
1 1/4 teaspoon kosher salt
Add in the bloomed saffron with the blooming liquid. Start adding the stock in batches. Start with 2 1/2 cups. Stir and cook on medium low. As the liquid starts to evaporate, add another couple of cups. Continue cooking until almost evaporated.
1/2 teaspoon saffron, 1 1/2 cups shrimps stock
At this stage the rice grains will start plumping up and softening but still has a grainy texture. Add in the final batch of the stock. Note: Once this batch of stock is added in don't stir or mix. You want the bottom of the rice to form a crust. Once the last batch of liquid is mostly evaporated, Sprinkle in the frozen peas. Season with a pinch of salt. Sprinkle in the roasted mushrooms. Continue cooking for 5 to 6 minutes.Note: Do not mix or stir the vegetables. Let the steam cook them. 1/4 - 1/2 cups English sweet peas
Turn off the stove. At this stage the rice should be fully cooked with a slight al dente texture. Cover the pan with a tight lid. Let stand for 10 minutes.