|1 1⁄2 fl oz||Dewar's 12 Year Old Scotch whisky|
|3⁄4 fl oz||Freshly squeezed pink grapefruit juice|
|3⁄4 fl oz||Honey syrup (3 honey to 1 water)|
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Delicately peaty Scotch whisky with rich rounding honey balancing tart zesty grapefruit.
When based on bourbon this becomes a Brown Derby.
This recipe is adapted from Judge Jr.'s 1927 Here's How! where its name (spelt "De Riguer" with one 'u') with the following introduction, "Hark, ye lads! Here's the very latest drink! Three of these will knock you for a row of aspirins."
The same recipe (½ Whisky, ¼ grapefruit juice, ¼ honey) is repeated in Harry Craddock's 1930 The Savoy Cocktail Book.