In a saute pan, melt the butter over medium heat. Add the leeks and saute until tender, about 3-4 minutes. Add the garlic and saute until fragrant, about 1 minute more.
Transfer the leek mixture to a food processor or blender, and add the peppers and ricotta. Process until smooth. Season with salt and pepper.
Set up a small bowl of water with a pastry brush. Brush two of the edges lightly with water, place filling in the center. Fold one side over the other, encasing the filling, and pressing to seal.
Brush one end with water, and press the ends together in the center. For more information on shaping tortellini, check out THIS great tutorial.
Cook the pasta in salted boiling water until tender, about 5-7 minutes. Drain.
Heat the remaining butter in a large saute pan. Add the ravioli, and saute to heat through.
Finish with lemon juice, zest, and parsley. Toss to coat, and serve warm.
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