The price of a BLT : Slicing the layers of the CPI

Over the summer, FRED added 1,479 new series on average prices for a wide range of consumer items. Almost half of the new data are prices of foodstuffs, more than enough for a seven-course dinner.
But to keep it simple, let’s make a traditional BLT sandwich: bacon, lettuce, and tomato on white bread. (Today, we’ll hold the mayo.) Like most things, the price of a BLT has risen over time, which you may have noticed at the local diner or in the supermarket. Let’s “go figure with FRED” what’s been driving up the price of this lunch staple.
The FRED graph immediately below plots the prices of all four ingredients over time. The prices of three of the ingredients rise at a fairly constant rate, which is a sign of low and stable consumer price inflation. But the fourth price (in red) is not only noticeably higher than the rest but rises

Federal Reserve Source