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In a large bowl, combine tempura batter, flour, ¼ cup sugar, and a pinch of salt. Whisk to evenly combine. Add milk and ⅓ cup water to bowl. Whisk until combined and no lumps remain, 30-60 seconds. Transfer funnel cake batter to a large liquid measuring cup or a bowl with a pour spout. TIP: This will make pouring the batter into the oil much easier and safer!