The first step to decoding Seamus's secret Irish whiskey recipe awaits on the following page, but you'll need the 4-digit code to access it.

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Here's a clue:

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The mash bill for Seamus's secret Irish whiskey recipe includes six grains: Malted Barley, Unmalted Barley, Wheat, Rye, Oat and Maize. 1% of the mash is Maize. 1% is Oat. Another 2% is split between Rye and Wheat. The rest is equal parts Malted and Unmalted Barley. 

 

_ _% Malted Barley _ _% Unmalted Barley