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3 Yukon potatoes, sliced into 1/4-inch slices

Salt and freshly ground pepper

1/4 cup olive oil, plus extra for greasing dish and brushing on lemons

3/4 pound white fish fillets, such as cod, flounder or tilapia

4 cloves garlic, minced

2 teaspoons minced fresh thyme

1/2 lemon, juiced

1 yellow onion, sliced

3 Roma tomatoes, thickly sliced

1/2 cup good quality black olives, pitted and lightly crushed and sliced in half

1 lemon, quartered

Special Equipment: 15 1/2-by-7 1/2-inch terracotta cazuela (baking dish)