Bret's Vegetable Bake

5 medium to large potatoes, cubed
2 carrots, chopped into 1/2 inch pieces
1 medium or half of a large sweet potato, cubed
1 zucchini , chopped into 1/2 inch cubes
1 can of diced tomatoes
1/2 tsp black pepper
1 1/2 tsp salt
1/2 tsp thyme
1/2 tsp sage
olive oil
lemon juice

Preheat oven to 375 degrees
Pour enough oil into an oblong 9x12 pan to cover the bottom.  Put all ingredients into the pan and stir until blended.
Bake for 1 hour.  Serve with sour cream.