I know, this is supposed to be a site of encouragement, and I am dropping dark pellets of pessimism all over your white hopes of success, but I think we need to ponder this a bit.
Nowhere that I know of has it been ascertained that you can get Lyme disease by eating a Big Mac or an ice-cream cone. It is a fact, however, that borrelia has been found in all kinds of animal products, including cow's meat and milk. While we don't know for sure if you can get Lyme disease by consuming these, it certainly seems plausible. Especially since borrelia is the super-bug of the century, able to withstand any kind of harsh living condition that is thrown at it, including extreme temperatures and long periods of time without sustenance. So it can be cooked, pasteurized, frozen and starved, conquering these conditions by changing into a cyst, until it finds itself in a safe environment again.
I'm sorry to spoil your appetite. Really, I am. But if you want to be on the super safe side, you might want to eliminate animal products from your diet. While I don't find it necessary yet to go to that extreme (I'm waiting for the first confirmed case of Lyme disease as a result of eating contaminated meat), I have started to consider the long-range implications for society if Lyme disease is able to be contracted via the consumption of food.
The first is that getting Lyme disease would no longer be a question of If, but rather, a question of When, the disease would manifest itself in everybody.
The second implication is that, should that nightmare scenario happen, then healing strategies would necessarily need to become focused upon building permanent immunity to borrelia, rather than just trying to combat it. Take heart; such strategies are already in the making. Most of them are found in energy medicine. IRT, Immune Response Training is one; Bioresonance techniques are another. Yet because these are relatively new therapies in the western world, only time will tell whether over the long run, they can provide lasting immunity.
In the meantime, take this sobering information with a grain of whatever little grain you prefer. Just make sure it's not too heavy on your system. That borrelia exists in our food is a fact worth pondering, not stressing over (yet).