Foaming pressurized beverage

1. A method of making a pressurized packaged liquid beverage, the method comprising:

filling a container with a liquid mixture including a base liquid and a gum, the container having a single internal chamber adapted to be agitated, the container further including a one-way valve adapted to allow a gas to enter the internal chamber but not exit;

sealing the container;

introducing a volume of gas through the one-way valve after sealing the container; and

agitating the container,

whereby when the container is opened, the liquid mixture increases in volume and separates into liquid phase and a drinkable foam phase.

2. The method of claim 1 , wherein the base liquid includes milk, coffee, fruit juice, or mixtures thereof.

3. The method of claim 2 , wherein the base liquid includes a mixture of milk and coffee.

4. The method of claim 3 , wherein the base liquid further includes chocolate.

5. The method of claim 1 , wherein the gum includes acacia gum, guar gum, locust bean gum, carrageenan, pectin, xanthan gum, or mixtures thereof.

6. The method of claim 1 , wherein agitating the container occurs simultaneously with introducing the volume of gas.

7. The method of claim 1 , wherein the volume of gas includes nitrous oxide.

8. The method of claim 1 , wherein the foam phase persists for at least 10 minutes after opening the first container.

9. The method of claim 1 , wherein the pressure inside the container after introducing the volume of gas and agitating the container is at least approximately 20 pounds per square inch (psi).

10. The method of claim 9 , wherein the pressure inside the can is between approximately 20 psi and approximately 60 psi.

11. The method of claim 1 , wherein the liquid mixture is fully saturated with gas after introducing the volume of gas and agitating the container.

12. The method of claim 1 , wherein the container is a can, bottle, or keg.