Combine marjoram and water. Let stand 15 minutes. Strain through fine mesh cheesecloth. Measure liquid and add water to make 1 c.
Strain lemon juice through cheesecloth. Combine lemon juice, sugar and herb liquid in a saucepan. Place over high heat. Bring to a boil; stir in pectin. Stirring constantly, bring to a full boil. Boil ½ minute. Remove from heat. Skim.