Shake up all the ingredients with some ice. Then, strain out the ice and dry shake the drink, without ice. Pour the liquid into a glass filled with ice, spray some lemon zest on the foam and garnish it with the lemon peel.

60 ml Union Lemon & Leaf (or Spice & Sea salt)
30 ml Fresh lemon juice⁠
15 ml Sugar syrup⁠ (or try a different infused syrup)
1 Eggwhite⁠

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Lemon & Leaf rum Sour cocktail with bottle