If you cannot roast your tomatoes and peppers, simply blend and boil the puree to remove the liquids(To boil, simply pour the puree into a pot and bring to a boil. Let it cook until all bubbles have disappeared and the puree has become a thick paste.
You could also cook the rice in the oven on 350 degrees if you wish.
If you're not using coconut milk; then make it up with some meat stock or water
If using basmati rice, pour boiling water into the rice. stir and drain; then add to the fried tomato puree