Gluing End Grain (cutting board)
First off, this is NOT an end-grain cutting board (I know the title is somewhat ambiguous). This is a long-grain cutting board that needs to be connected at the end-grain.
I know this is the weakest way to glue something, so I want to know what will be sufficient. The board will be 20 inches long and 15 wide, with four 5-inch segments joined together (3/4 inch thick). Will just glue be sufficient? Should I cut a slot lengthwise and put some wood in there (like an elongated biscuit)? Pegs? What's the best way to join these boards and get the necessary strength?