Marmitako

Yield:	4 Servings
Categories:

3	tb	Olive oil
1/2	md	Onion, sliced
2		Garlic cloves finely chopped
4		Plum tomatoes, seeded and chopped
1/4	c	Drained capers
4		All-purpose potatoes, peeled & cut into 1/2 inch slices
2	c	Chicken broth
1	lb	Fresh tuna, cut into 4 pieces
		Salt & black pepper