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Preheat oven to 350°F.
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Melt chocolate and margarine, then combine with sugar, flour, vanilla, salt, and eggs. Blend with electric mixer on low until thoroughly mixed.
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Spread mixture into a greased 13"x9" baking pan.
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Bake for approximately 35 minutes - until a toothpick stuck in the centre of the pan comes out clean.
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Allow bars to cool completely in the pan on a cooling rack.
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Combine icing sugar, water, and peppermint extract to make the icing.
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The icing needs to be drizzled over the cooled bars, so consistency may need to be adjusted. If the icing is too watery, add a little more icing sugar; if the consistency is too thick, add a little more water.
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Stir green food colouring into the icing until you are happy with the colour.
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Use a spoon to drizzle icing back and forth, up and down all over the cooled bar mix.
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Allow icing to set by placing the pan in the refrigerator. Cut into bars.