Heat vegetable oil in a large pot over medium heat.

Add minced onion, green pepper, and minced garlic to the pot.

Saute until the vegetables are tender, about 5-7 minutes.

Add sliced carrots, crushed tomatoes, uncooked lentils, bay leaf, thyme, and oregano to the pot.

Pour in water and bring the mixture to a boil.

Reduce heat to low and simmer for about 1 hour, or until the lentils are soft.

Stir in lemon juice, salt, and pepper to taste.

Serve hot.