I have a question about the ingredient "half n half" on the recipe "Carmel Chocolate Concrete" from lorigoldsby.
What is your question about half and half? It is half milk, half cream so about 10.5–18% fat content. Are you not in the U.S.? If not, you can use half cream or single cream.
No am not in the US sorry
Did this answer your question sufficiently, depending on your country, this Wikipedia page should help as it lists fat content of creams for different countries: