Croque Monsieur with Avocado and Tomato
MAKES 4 PREP & COOK 30 MINS
■ 8 x 1cm-thick slices sourdough, toasted
■ 4 slices leg ham
■ 1 avocado, sliced
■ 1 tomato, sliced
CHEESE SAUCE
■ 50g butter, chopped
■ 2 tblsps plain flour
■ 1 cup milk
■ 1 cup finely grated Gruyère cheese
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