Preheat oven to 400 degrees F.
Line a 13 by 9-inch baking pan with aluminum foil.
Lay out almond slivers on baking sheet. Bake in oven until light brown, shaking the baking pan occasionally to mix them around, about 10 to 15 minutes.
Melt the chocolate morsels in a double boiler over low heat. Mix in the cranberries, almond slivers and tangerine zest.
Pour into prepared pan. Smooth the chocolate mixture out into an even layer. Cool to room temperature and then refrigerate until hard, at least 1 hour. Use a knife to break up chocolate into jagged, varied sized bars.