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Preheat the oven to 350°F. Lightly grease an 8 1/2" x 4 1/2" loaf pan.
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In a medium-sized bowl, beat together the brown sugar, boiled cider or other liquid, vegetable oil, eggs, and vanilla until smooth.
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Whisk the baking powder, baking soda, salt, and cinnamon into the flour, then add the dry ingredients to the liquid ingredients in the bowl, stirring or beating gently until smooth.
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Stir in the zucchini, walnuts, and raisins or currants.
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Scoop the batter into the prepared pan, smoothing it if necessary. Sprinkle with brown sugar.
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Bake the bread for 55 to 65 minutes, until a toothpick inserted into the center comes out clean. The top (just under the crust) may seem a bit sticky; but so long as the toothpick doesn't reveal wet batter, it's done.
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Remove the bread from the oven, and cool it in the pan for 10 minutes. Turn it out of the pan onto a rack to cool completely. For best results, don't slice until it's cool.
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Store the bread at cool room temperature, well wrapped, for several days; freeze for longer storage.