Cottage Pie

Ingredients

• 1 tablespoon olive oil
• 1 cup diced onion
• 1 cup diced celery
• 1 cup diced carrots
• 1 pound ground beef
• 1 tablespoon butter
• 1 tablespoon flour
• 1 cup water
• 2 tablespoons tomato paste
• 1 teaspoon seasoning
• 2 pounds potatoes
• 1 cup milk
• 1 cup cheese