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Bourbon mashbill: wheated vs high-rye - where the sweet or spicy flavour comes from

Bourbon by definition must have at least 51 percent corn in its recipe - it is the corn that gives it its characteristic sweetness. But the flavour is decided by all the rest, that is the remaining grains in the mashbill, as the grain recipe is called. It is precisely they that create the two main styles of bourbon, which taste completely different: wheated, with wheat as the secondary grain, soft and sweet, and high-rye, with a large amount of rye, spicy and sharp. This one choice in the recipe can change bourbon from a gentle, biscuity drink into a spicy, peppery one. Understanding the mashbill is the key to predicting how a bourbon will taste. Here is a guide to bourbon recipes: what a mashbill is, how wheated differs from high-rye and where their flavours come from.

What a mashbill is

A mashbill is the grain recipe of a bourbon - the exact formula for which grains and in what proportions make up the distillate. By law bourbon must contain at least 51 percent corn, which gives it its base sweetness and biscuity, corn character. But the remaining up to 49 percent is room to play: the distillery chooses secondary grains that shape the flavour. Usually it is rye or wheat as the flavour grain, plus a small amount of malted barley, needed for fermentation. It is precisely the choice and proportion of this second, flavour grain that divides bourbons into styles. The mashbill is therefore the DNA of a bourbon, deciding its character even before distillation and the cask. Understanding that it is the grain recipe, not the corn alone, that shapes the flavour is the starting point for the rest. We cover bourbon itself more in bourbon explained.

The role of corn

Let us begin with the common foundation of all bourbons: corn. It is corn, as a minimum 51 percent of the recipe, that gives bourbon its recognisable character - sweet, biscuity, with notes of corn, vanilla and caramel. The more corn in the mashbill, the sweeter and gentler the bourbon. Some bourbons, called corn-forward or high in corn content, go well above the minimum, giving an exceptionally sweet, soft profile. Corn is the sweet base on which the whole flavour is built. But corn alone would give a rather one-dimensional drink - which is why flavour grains are added, which bring complexity and character. It is like a base and a seasoning: corn is the sweet foundation, and rye or wheat is the seasoning giving direction. Understanding the role of corn as the sweet foundation helps grasp what the other grains do. It is they that decide the style.

Wheated: wheat and softness

Wheated bourbon is a style in which the secondary grain (instead of the typical rye) is wheat. This one change completely reshapes the profile. Wheat amplifies the perceived sweetness and showcases the bakery notes, giving a bourbon soft, smooth and gentle. Typical notes are vanilla, cream, light caramel, biscuit, pie crust and soft fruit, like apple or pear. Interestingly, wheat also smooths the perception of the alcohol, so a wheated bourbon seems gentler and less sharp, even at the same proof as others. The most famous example is Maker’s Mark, with a recipe of 70 percent corn, 16 percent red winter wheat and 14 percent malted barley - with no rye. This gives a sweet, smooth profile dominated by caramel, vanilla and toffee. Wheated is a style for those who like a gentle, sweet and soft bourbon. It is the wheaten, soothing face of bourbon.

High-rye: rye and spice

High-rye bourbon is the opposite of wheated: a style with a large amount of rye as the secondary grain, often around 30 percent of the recipe. Rye is a grain of sharp, spicy and aromatic oils, which give the bourbon a completely different, spicy character. Typical notes of high-rye are black pepper, clove, cinnamon, sometimes mint or citrus peel - spicy, sharp and expressive. In the mouth high-rye is often leaner, drier and more athletic, which some interpret as an impression of higher proof, even when the label says otherwise. It is a bolder, more complex and peppery bourbon, far from the soft sweetness of wheated. It is a style for those who like character, spice and sharpness. High-rye is the spicy, energetic face of bourbon. The more rye, the spicier and more expressive the drink. We cover the rye grain itself more in rye whiskey.

A table: wheated versus high-rye

Let us gather the two styles in one place:

The table shows how one change in the recipe - wheat instead of a large amount of rye - shifts bourbon from gentle and sweet to sharp and spicy. They are two opposite poles of the style.

In between: the traditional mashbill

It is worth adding that between these poles lies the most common, traditional bourbon mashbill. It is a recipe with a moderate amount of rye (usually in the teens of percent), giving a balanced profile - the sweetness of corn plus a touch of the spicy seasoning of rye, but without extremes. Most popular bourbons are precisely this middle: neither outstandingly wheaten and soft, nor strongly rye and spicy. It is a safe, universal base, which many people associate with the flavour of bourbon in general. Wheated and high-rye are deliberate departures from this middle in two directions: towards softness or towards spice. Understanding that there is a whole axis from wheaten sweetness to rye sharpness helps place any bourbon. The traditional mashbill is the point of reference, and wheated and high-rye are its expressive variants. Every bourbon can be placed on this axis.

Why it matters for flavour

Understanding the mashbill gives a practical power: it lets you predict how a bourbon will taste before you try it. Seeing wheated, expect softness, sweetness, vanilla and caramel - a gentle, soothing drink. Seeing high-rye, expect pepper, spice, sharpness and dryness - a bold, complex character. This explains why two bourbons from the same distillery and of a similar age can taste completely different - the difference is the grain recipe. For the drinker it is a key to a deliberate choice for one’s own taste: you like it sweet and smooth, reach for wheated; you like it sharp and spicy, for high-rye. The mashbill is the first filter in choosing a bourbon, more important than many people think. Understanding it is going deeper into the world of American whiskey. It is the DNA of flavour written in the recipe. We cover the whole category more in grain whisky.

How to sense it in the glass

The mashbill styles are easy to sense once you know what to look for. A wheated bourbon is soft and sweet: clear vanilla, caramel, toffee, biscuit, pie crust and gentle fruit, a smooth, soothing feel without sharpness. High-rye is spicy: black pepper, clove, cinnamon, sometimes mint and citrus, a leaner, drier and more energetic feel. If a bourbon seems sweet, smooth and biscuity, it is a clue for wheated; if spicy, sharp and peppery, high-rye. It is worth comparing Maker’s Mark (wheated) with a clearly rye bourbon, to feel the whole range. Notice the finish: wheated is sweet and soft, high-rye spicy and dry. Over time you will start to recognise the mashbill style by the first sip and choose deliberately. It is one of the most practical skills for a bourbon lover.

The essentials in brief

Let us gather it up. A mashbill is the grain recipe of a bourbon, which by law must have at least 51 percent corn giving a sweet, biscuity base. The style is decided by the secondary grain. Wheated bourbon uses wheat instead of the typical rye, giving a profile soft, sweet and smooth, with notes of vanilla, caramel and biscuit (the classic: Maker’s Mark, 70 percent corn, 16 percent wheat, 14 percent barley, no rye). High-rye uses a large amount of rye (about 30 percent), giving a profile spicy, peppery and warming, with notes of clove, cinnamon and mint. Between them lies the traditional, balanced mashbill. Understanding the recipe lets you predict the flavour of a bourbon before tasting. Now you know where the sweet or spicy character comes from and how to recognise it.

Note every whisky in GustoNote - including the mashbill style, if you know it. Over time you will start to recognise soft wheated and spicy high-rye by flavour.