INGREDIENTS
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Vegetable-oil cooking spray
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5 large egg whites
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1 1/4 cups sugar
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1/8 teaspoon fine salt
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1/4 teaspoon cream of tartar
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1 teaspoon liquid coffee extract (preferably Trablit; culinarydistrict.com), divided
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1 1/3 cups sliced natural almonds (4 1/2 ounces)
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1 1/4 teaspoons flaky sea salt, such as Maldon, divided
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3 scant tablespoons high-quality roasted coffee beans
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2 1/2 pints coffee ice cream (preferably Haagen-Dazs)