Use bouillon cube to make broth according to package instructions, adjusting water to desired strength. (Generally, add 1 bouillon cube to ¼ to ½ cup hot water and stir until dissolved.) Place prepared broth in a shaker of ice.
Add vodka and lemon juice and shake to combine ingredients and chill mixture. Taste and add more water if broth tastes too strong.
Place Old Bay Seasoning in a shallow flat bowl. Moisten the rim of a 2-ounce shot glass with the lemon wedge and dip the glass rim into the seasoning.