Shrimp and Sausage Jambalaya

Name: Shrimp and Sausage Jambalaya
Ingredients: 1 tbs extra virgin olive oil; 1 lbs andouille sausage; 1 tbs butter; 1 medium onion; 1 red bell pepper; 1 cup celery; 1 tomato; 5 cloves garlic; 1/2 tsp. cayenne pepper; 2 tsp oregano; 1 tsp thyme; 2 tbs tomato paste; 6 cups chicken stock; 3 cups long grain rice; 3 bay leaves; 2 tsp kosher salt; 1 tsp black pepper; 6-8 dashes hot sauce; 1/2 cup scallions; 3/4 cup fresh italian parsley; 1/4 cup fresh lemon juice; 2 1/2 lbs fresh large shrimp