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1
Sift together the all-purpose flour, cornstarch, rice flour, baking powder, salt, and cayenne.
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2
Whisk in the soda water, a little at a time, until the right consistency is achieved: The batter should coat the back of a spoon, but some should run off the spoon.
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3
Let the batter rest in the refrigerator for at least 1 hour.
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4
Combine the goat cheese, chives, basil, and olive oil in a medium bowl.
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5
Season with salt and pepper and mix well.
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6
Scoop up 1 tablespoon of the filling and shape into a ball; repeat with the remaining mixture.
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7
Make sure the squash blossoms are well cleaned: Inspect each flower for insects and any browned petals.
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8
Open each flower and insert 1 ball of the goat cheese filling.
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9
Gently press the filling into the base of the flower.
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10
Close the petals and pinch the top to seal.
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11
Refrigerate for 30 minutes.
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12
Heat a deep-fryer or a deep pot with 2 inches of oil to 375F.
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13
Hold a squash blossom by the stem and dip it into the tempura batter, making sure to coat it completely.
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14
Let any excess batter drip off.
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15
Place the blossom in the oil and fry until golden brown, 1 to 2 minutes, turning often to brown evenly.
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16
Remove to a paper-towel-lined plate.
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17
Repeat with the remaining blossoms.
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18
Serve immediately.