Preheat a pan with some olive oil.
Star by frying the yellow onion and garlic for 1-2 minutes.
Next add the red bell pepper and fry for another 1-2 minutes.
Add the diced tomatoes and stir to combine. Fry for another 1-2 minutes.
Add the red rice, paprika powder, cayenne pepper and saffron and fry for 2 minutes.
Add the water and vegetables stock powder and put a lid over the pan. Let it shimmer on low heat for about 20 minutes. Add more water if needed.
When about 7-8 minute remain for the rice to be ready add the mussles to the pan and peaheat a nonstick pan over medium heat.
Fry the sliced chorizo until golden brown then add it to the paella pan.
Next fry the prawns for about 1-2 minutes on each side. When ready add to the pan. (Or skip this step and add to the pan right away at let them steam).
Fry the scallops for 1/2-1 minute on each side.
Drizzle the lemon juice over the paella and stir to combine.
Add the scallops on top and garnish with chopped parsley.
Serve warm.