Leviticus 9 Priestly duties

Leviticus Chapter 9

Aaron and sons are now fully ordained and set apart as priests, and the chapter describes the 5 animals sacrificed - a calf for Aaron and sons, a lamb as a burnt offering and goat for a people's sin offering, an ox and a ram as fellowship offerings along with a grain offering.

The sacrifice of animals like this seems very odd today, though even today orthodox Jews will ensure their meat is kosher, which means that it is slaughtered in a ritual manner by a rabbi. 
I guess as a meat eater I don't think I can take any kind of moral high ground on the subject of animal sacrifice, though I prefer free range and humanely slaughtered over factory farmed to whom death may have been a relief.

On their first day on the job, fire comes out from God’s presence and burns up the offerings on the alter, which elicits celebration and worship from the general populous.