As an experienced sommelier and brewer, I can certainly provide you with a detailed answer on how to break the seal on a cocktail shaker. Breaking the seal can sometimes be a bit tricky, but with the right technique, it can be easily done.
One method that I have found to be effective is to use a combination of heat and cold. Start by filling your sink with some ice and water. Then, take the cocktail shaker and submerge the bottom part, where the liquid is, into the ice water. Let it sit for a few minutes to allow the metal to cool down.
While the bottom part is cooling down, you can focus on the top part of the shaker, which usually has the lid that forms the seal. Hold the shaker sideways over your sink and run some hot tap water over the top part, specifically targeting the lid. The hot water will cause the metal to expand ever so slightly, which can help loosen the seal.
As you run the hot water over the lid, try gently twisting or turning it to see if it starts to loosen. Be careful not to apply too much force, as you don't want to damage the shaker or risk any spills. The combination of the hot water and the expanding air inside the shaker should help to break the seal.
If the seal still doesn't break, you can try using a towel or oven mitt to hold the top part of the shaker and give it a few firm taps on the side of the sink. This can help to dislodge the lid and break the seal.
It's important to note that different cocktail shakers may have slightly different mechanisms for sealing, so this method may not work for all shakers. Additionally, if you have a shaker with a built-in strainer, be cautious not to damage the strainer while attempting to break the seal.
In summary, to break the seal on a cocktail shaker, start by cooling down the bottom part in a sink filled with ice water. Then, use hot tap water to heat up the top part, specifically the lid, while gently twisting or turning it to loosen the seal. If needed, give the shaker a few taps to help dislodge the lid. Remember to exercise caution and avoid using excessive force.