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In a medium sized pan, heat butter and flour on medium heat. Stir well and cook until golden brown.
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Stir garlic, onion, leek, carrots and squash. Cook mixture for 3 minutes.
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Add water, thyme, Oyster Sauce and parsley. Cook mixture until vegetables are tender. Cool for 10 minutes.
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Transfer mixture into a blender. Process until mixture is smooth.
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Return mixture into the sauce pan. Add heavy cream and half and half.
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Cook mixture until heated through. Season with salt and pepper.