Casserole Paisano

Ingredients

• 6 medium (approximately 2 pounds) potatoes, peeled, halved and very thinly sliced
• 3 large onions, halved vertically and thinly sliced
• 4 garlic cloves minced
• 1 28-ounce can plum tomatoes, chopped and drained
• 1/4 cup tomato paste
• 1/2 cup fruity olive oil
• 3 tbsp. water
• 2 tsp. dried oregano
• Salt, to taste
• Freshly ground black pepper, to taste