Heat oil in a paella pan (or large frying pan) and add the onion and pepper. Gently fry over a medium heat for approx. 5 minutes (until the onion has started to turn brown at the edges)
Add garlic and smoked paprika and fry for a further minute.
Add the tomatoes and water and bring to the boil.
Add the quinoa and simmer for 10 minutes (stirring occasionally)
After the 10 minutes, add the prawns and peas to the pan.
Simmer for a further 10 minutes.
Cover with a dishcloth and allow to sit for 2 minutes.
Add the juice of one lemon, stir and serve.