Cut onions into 1/4-inch-thick slices, and separate into rings. Combine onions, salt, and next 5 ingredients, tossing to coat.
Melt butter in a large heavy skillet over medium heat; add olive oil and onions, and cook, stirring constantly, 25 minutes or until onions are tender and lightly browned.
*A dash of turmeric may be substituted for saffron.
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