Vegan jambalaya recipe with quinoa

Name: Vegan jambalaya recipe with quinoa
Ingredients: Half a green pepper, diced; Half a red pepper, diced; 2 celery stalks, chopped; 1 onion or green onion, diced; 4 cloves of garlic, minced; 1 can (400 grams / 14 oz.) crushed tomatoes; 4 cups (1 liter) vegetable stock; 1 teaspoon dried oregano; 1 teaspoon dried thyme; 2 teaspoons sweet paprika; 1 teaspoon dried cayenne pepper; Pepper, to taste; 2 cups (400 grams) uncooked quinoa (washed); 3 cups (500 grams) mixed beans (I used white beans, kidney beans and chickpeas); 1 cup fresh chopped parsley; some lemon to taste or up to 1 teaspoon salt (optional)