This is a great breakfast option with eggs.  Lovin' it!

2 tablespoons oil
1 onion, thinly sliced
1 garlic clove, minced
1 teaspoon curry powder, (or cumin powder or 1/4 teaspoon cayenne or other spices, etc.), optional
about 1 pound cooked potatoes, cut into chunks (cold)
about 1/2 pound cooked cabbage (cold)
salt and pepper to taste

Heat oil in skillet over medium heat.  Add onion and cook, stirring until softening about 5-7 minutes.  Add garlic and optional curry powder (or other spice combo) and cook for about 1 minute.  Add potatoes and additional oil and cook for a few minutes, stirring, until browning.  Add cabbage and cook another few minutes, stirring.  Season with salt and pepper and serve hot!