Finely chop 1 leek and cook until softened. Set aside.
Heat a medium saucepan over medium-low heat and add margarine, flour, and minced garlic. Whisk to combine, and continue to cook for 3 minutes while the roux cooks. At this point, the garlic should be very fragrant and the roux should begin to darken in colour slightly.
Begin to stir in a2 Milk® Full Cream a few splashes at a time. Ensure each batch fully incorporates into the flour mixture prior to adding more. Continue until all milk has been added. Heat the sauce to a gentle simmer.
Add pecorino cheese a handful at a time, stirring fully into the sauce until you have a smooth and creamy consistency.
Add the peas and leek, stir to combine.
Add salt and pepper.
Remove from heat and serve over pasta of your choice.
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