Hamburger Lentil Soup for the Slow Cooker

1 lb ground beef
1/2 cup onions, chopped
4 carrots, diced
2 ribs celery, diced
1 garlic clove, minced or 1 tsp garlic powder
1 can tomato soup
2 tsp salt
2 cups dry lentils, washed with stones removed
1 quart water
1/2 tsp dried marjoram or thyme
1 Tbsp brown sugar

1. Brown ground beef and onions in skillet. Drain.
2. Combine all ingredients in slow cooker.
3. Cover. Cook on low 8-10 hours or high 4-6 hours.