Fried Sweet Plantains (platanos maduros fritos)

From http://www.recipezaar.com/79727

This is a terrific Cuban side dish or, as we have them, just a snack. You can serve these with rice and beans and entrees of meat or fish. Plantains are becoming more available in grocery stores and they're really tasty!

1/4 cup butter
1 tablespoon olive oil
3 ripe plantains, peeled and cut diagonally into 1 inch slices
1/2 lemons, juice of
salt

1.In a large skillet, melt the butter with the olive oil over medium heat
2.Add the plantain slices and fry for about 4 minutes on each side, moving the slices with a spatula occasionally to prevent sticking.
3.Remove the plantains from the skillet with a slotted spoon and let drain on paper towels.
4.Transfer to a large, warm serving platter, sprinkle with lemon juice and salt and serve warm.
*unripeplantains are green and hard, as they ripen they turn yellow and then get mottled with dark spots
5. Ripe plantains are sweet and soft and are brownish-black in color and resemble overripe bananas
6.To ripen a plantain, keep them in a warm place until they turn yellow, then brownish-black.