Jansson's Temptation Swedish Potato and Anchovy Casserole

Yield: 8 Servings
Categories:
2lgOnions; sliced (or 3)
3tbUnsalted butter
6Russet (baking) potatoes
1cnFlat anchovy fillets (2 oz); drained, reserving the oil and chopped
1 1/2cHeavy cream
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