recipe_convert_ingredient

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Converts an amount of one ingredient between cup, tablespoon, teaspoon, millilitre, gram and ounce using that specific ingredient's own USDA FoodData Central portion weight, not a single water-based figure applied to everything -- a cup of flour (125 g) and a cup of honey (339 g) do not weigh the same. Supports an ingredient's own measurement-style variants where USDA publishes more than one (packed vs loose brown sugar, sifted vs unsifted powdered sugar, whole vs sliced/slivered/ground nuts, etc.), and for baking powder, baking soda and yeast uses USDA's own published teaspoon weight rather than dividing the cup weight by 48, since a spoon measurement of a fine powder is not proportionate to its cup measurement. Also reports, for information, what a generic water-density converter would have said for the same input and by how much that would have been wrong -- omitted when the requested unit is already grams or ounces.