Leviticus 2 Grain offerings were given at various times and in various ways.  It could be presented as:
fine flour
baked in an oven
made on a griddle
made in a pan.

It might be an offering of the first fruits of the seasons harvest.  Or it might be part of an offering of thanksgiving.  No matter how it was presented or why it was presented, the grain was to be accompanied or mixed with oil.  Sometimes frankincense was also added to the offering .  Also, a portion of the offering was placed on the altar and the rest went to the priests.  This was a provision for them to eat.  Leaven was not allowed to be mixed with the grain when it was offered on the altar.  It was to be only fine flour mixed with oil.  Nothing added, but salt.  Verse 13 gives us some insights - " Every grain offering of yours, moreover, you shall season with salt, so that the salt of the covenant of your God shall not be lacking from your grain offering; with all your offerings you shall offer salt." It was considered a " most holy" thing.

The salt of the covenant or covenant of salt is mentioned again in Numbers 18:19 " All the offerings of the holy gifts, which the sons of Israel offer to the Lord, I have given to you and your sons and daughters with you, as a perpetual allotment. It is an everlasting covenant of salt before the Lord to you and your descendants with you." This was spoken to Aaron and his sons.  A gift, a daily provision and a holy  responsibility.
Salt was considered vital and of great value in those days.  A preservative, regarded as something lasting, was a symbol of Israel's everlasting covenant relationship with God, according to the Bible Knowledge Commentary.  The covenant was the foundation of the sacrificial system.

The BKC also says this about the grain offerings - "Since the grain offering involved the Israelite's normal food and cooking methods , it may have symbolized the dedication of everyday life to God and perhaps the recognition of God's provision of daily needs."  

"Give us this day our daily bread."  Jesus instructs us to pray.   He also tells us, when taking the bread, " Take, eat; this is My body."  The grain offering is broken into bits, into crumbs, and oil is poured on it.  It is presented to the priest who puts a memorial portion on the altar where it is burned up in smoke, "an offering of fire of a soothing aroma to the Lord."  Jesus offered up His body, broken and poured out for us.

God is the giver of the Bread of Life.  We who partake of this most holy gift are brought into an everlasting covenant with our God.  We who pray for and receive our daily Bread are blessed and thankful and overwhelmed with this precious gift. And out of our joyful and grateful hearts, we bring our sacrifice of thanksgiving - from our first fruits, from our everyday provisions that God has freely given - we bring our tithes and offerings to lay at His feet.  We bring it to the Church, which is the Body of Christ.  And out of that God provides for those who have the responsibility of leading and teaching the Word.

Father, as we meditate on these Words, help us to grasp the greater truths and the deeper meanings.  The covenant that we have with You; the provisions that You have supplied; the wonder of the broken body of Christ.  Give us today our daily Bread.  The food for our bodies, yes, but more than that the food for our souls.  The life of Christ in us.  The life that we have as the body of Christ, His church.
Fill us Holy Spirit, cover us with the oil of gladness.  Overwhelm us with everlasting life in Jesus our Lord. To the glory of God. Amen