Wild Rye and Rhubarb Collins

Rhubarb is the first edible thing that comes up in a Minnesota garden after the snow goes. Before the asparagus, before the radishes, before any of the spring greens, the rhubarb is already pushing pink stalks out of the ground in April, often through the last of the snow. For a state that has spent five months looking at frozen ground and eating from a pantry that had to be planned in October, the rhubarb's arrival is a small but significant event. It is the proof that the growing season has actually started, that the soil has warmed enough to wake up the perennials, that there is going to be food coming out of the ground again. The first rhubarb of the year is not just an ingredient. It is a piece of cultural information.

The plant itself is stubborn. It is a perennial, which means it returns from its own root every year without replanting, and a well-established rhubarb patch in Minnesota will produce for thirty or forty years with very little intervention. The leaves are toxic — they contain enough oxalic acid to be genuinely dangerous in quantity — but the stalks are sour and assertive in a way that very few vegetables manage. They refuse to be sweetened into submission. Sugar gentles rhubarb, but it does not transform it. The acidity is the point, and a kitchen that respects rhubarb will let that acidity carry through to the finished dish.

The Shrub as Form

A shrub is structurally different from a simple syrup, and that difference matters here. Simple syrup is sugar and water, dissolved by heat, contributing sweetness and texture but no flavor of its own. A shrub is fruit, sugar, and vinegar — sometimes built with heat, more often built cold over several days through maceration. The fruit gives up its flavor to the sugar through osmotic pressure. The vinegar then extracts further compounds and stabilizes the whole mixture for storage. The result is a syrup that carries fruit flavor with an integrated acid spike, which is exactly what a long cocktail wants from its sweetener.

For the rhubarb shrub, combine equal weights of chopped rhubarb stalks and white sugar in a jar and refrigerate for twenty-four hours. The sugar will draw the rhubarb's juice out and the contents of the jar will go from dry to wet to nearly syrupy as the cells release their water. Add an equal weight of apple cider vinegar, stir, and refrigerate for another two to three days. Strain through a fine mesh into a clean bottle. The shrub will keep in the refrigerator for three weeks and gets more integrated in the first week as the rough edges of the vinegar round into the fruit. Use raw apple cider vinegar if you can; the unfiltered kind with the mother in it gives a more complex result than the clarified supermarket product.

The macerated rhubarb solids that you strain off are not waste. Stir them into a yogurt, spoon them over vanilla ice cream, or fold them into a quick coffee cake batter. They have given up some of their sweetness to the shrub but they have absorbed enough vinegar character to be interesting in their own right.

The Collins Form

The Collins is one of the simplest cocktail forms in the standard repertoire: spirit, citrus, sugar, and soda, built tall over ice. The Tom Collins is the canonical version, built on gin. Substitute almost any base spirit and you have a Collins variant — vodka, rum, tequila, and yes, rye. The form's flexibility is its strength. It is a vehicle for letting a single ingredient lead while keeping the structural relationships balanced.

The rye in this Collins is doing structural work that gin could not. Gin would compete with the rhubarb for botanical attention. Rye recedes behind it and provides a grainy, slightly peppery backbone that supports the fruit without arguing with it. Use a Minnesota rye if you can find one. The local distillers have been producing ryes in styles that range from soft and grainy to spicy and high-proof; for this drink, lean toward the softer styles, which let the rhubarb stay forward. A high-proof, aggressive rye will overwhelm the shrub.

Spring Timing

This is a cocktail with a specific window. The rhubarb is at its best from late April through early June. After that the stalks get stringier and the season produces enough other things — strawberries, asparagus moving toward peak, the first greens — that the rhubarb stops being the most interesting thing in the garden. Make the shrub during the window and use it through July. By August you will be ready for the summer fruit cocktails and the rhubarb will have receded into the next year's anticipation.

Build over ice in a highball. Add the rye, the shrub, and the lime. Top with soda. Stir gently — you want to integrate without killing the carbonation — and garnish with a thin ribbon of fresh rhubarb if you have one to hand. Drink it on a Minnesota afternoon in May when the trees are leafing out and the long winter has finally relented.