From the Sources
In the Brit Bein Habetarim, the “Covenant Between the Parts”, Avram was told to take three calves, three goats three rams, a pigeon and a dove. Each animal is split in half, but the birds, which represent the Jewish people, are left whole. After dark, a fire passes through the animals and birds.
How to eat it
If you can find a kosher dove and pigeon, that would be terrific, but I think it is probably unlikely. So you could roast, or even better, barbeque two small chickens, or two spatchcock, to serve for Friday Night dinner.