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In a pot of boiling salted water, cook pasta as per packet directions. Drain the pasta 2 minutes before the suggested cooking time and reserve ½ - 1 cup of pasta water.
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In a large fry pan on a low - medium heat, heat the olive oil and fry the onion and garlic for five minutes or until fragrant and translucent. Stir occasionally to prevent the garlic from burning.
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In the same pan on a high heat, add the peas, chicken stock, lemon juice and a big pinch of salt and pepper and bring to the boil.
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Once boiling, take the pan off the heat and leave to slightly cool.
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Place the cooled mixture into a blender and blend until you have a silky smooth texture.
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On a low heat, place the sauce back into the fry pan with the lemon zest, cooked pasta shells and a splash of pasta water.
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Slowly incorporate the parmesan cheese and keep stirring until a thickened and glossy pasta sauce forms. Add more pasta water if needed.
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Take the pasta off the heat and finish off by stirring through the ricotta and sprinkling over fresh herbs.
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Serve and enjoy with family and friends!