Add another tablespoon of olive oil to the pan and heat on medium high for one minute.
Add 1/2 medium yellow onion, finely diced and stir to combine. Sauté for 5-6 minutes or until the onions begin to turn translucent.
Add 1 red bell pepper, finely diced and 2 stalks celery, finely diced and stir to combine with the chopped onion. Sauté for 5-6 minutes until the vegetables begin to soften, now add 3 cloves grated garlic, stir to combine and cook until the garlic becomes fragrant.
Add 1 cup basmati rice and stir to combine, tossing with all the vegetables.
Add 1 cup chicken stock, a 15 oz can fire roasted chopped tomato, 1 tbsp tomato paste and 1/2 lemon juiced. Stir to combine, reduce heat to medium low, cover with a lid and cook for 20-25 minutes, or until the rice has cooked. Check after 15 minutes and if the rice is almost done but there seems to be too much juice, remove the lid and cook for the last 5-10 minutes uncovered.
When rice is fully cooked, fold in cooked sausages and top the dish with the reserved shrimp.