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cream butter, sugar, egg yolk, and vanilla.together for 2 minutes with mixer on medium speed.
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reduce speed to low.add flour and salt -- blending well.
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shape dough into 1" balls.
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arrange 1" apart on ungreased cookit sheet.
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make an indentation incenter of each ball, using your thumb or back of spoon.
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spoon 1/2 tsp of filling into each center.
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bake at 325 for 12-15 minutes.let stand on sheet for 1 minute.then remove to rack to cool completely.
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to prepare FILLING:.
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combine first 4 ingredients in small saucepan.
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heat over medium heat till mixture comes to a bil and begins to thicken --
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stirring constantly -- remove from heat and stir in food coloring.set aside to cool to room temperature.