He shall take there out his handful. This was the task of the priest. The handful that he took and burnt upon the altar has the technical and significative name of the memorial. It acted as a memorial before God, in the same way as Cornelius's prayers and alms—"Thy prayers and thine alms are come up for a memorial before God" (Acts 10:4)—being something which should cause God to think graciously of the offerer.
The frankincense is not mixed with the flour and the oil and the salt, as a constituent element of the offering, but is placed upon them, and is all of it burnt in "the memorial," symbolizing the need of adding prayer to sacrifice, that the latter may be acceptable to God.