Here's a guide to picking the best potato variety for mashing, baking, or frying

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I'm picky about my apples (Fujis are my favorite because they are so crispy), but I've always been indiscriminate about potatoes for my entire grocery-buying life. I know the difference between a sweet potato and a non-sweet potato, of course, but that's the extent of my knowledge. When I go potato shopping, I just grab spuds willy-nil…