Collect it. Put it in a little obsidian box and feed it high essential count items and get a god tier nodejust saw my first hunger nodes... in the nether. How are people collecting or mining these things up? As soon as you are close enough to do something, you're screwed.
Playing AS - I originally ran my Vanilla + Harvestcraft crops [70 crops over 13 9x9 plots / 11 Planters + 12 Harvester + Fruit Picker (for Cocoa)] off 5 Culinary Gennys all running off Grilled Mushrooms with plenty of energy to spare. 100RF/t with each grilled mushroom lasting all of 2 secs. I'm switching over to Bacon Mushroom Cheeseburgers [if I can get the stuffed itemduct issues solved w/o resorting to AE]. Notice this doesn't include any of Harvestcraft's trees yet. And all without any animal byproducts!I think I've figured out how I'm going to power everything using the food challenge configs. I'm going to run the whole thing off grapes!
Growthcraft grapes to be exact. One golem with enough upgrades can harvest 16 grape vines. With 2 water upgrades and the spectacles, it will harvest in a 7 block radius from its home. That is enough to harvest an entire row of grapes from two plants (14 blocks--the golem will harvest 15 blocks total.) In a 15x16 area, you can fit in 16 grape vines. They grow at a pretty decent rate, so should be able to give a decent amount of power.. 40RF/tick for 6 seconds I believe (when made into grape salad). I have a feeling that the grapes will grow faster than my little golem can harvest, but we will see. I used a flesh golem because of the above average speed. One could probably use an advanced golem and add in a speed upgrade and the bowtie (I think that one is the speed upgrade) to make it a bit faster.
With the culinary generator, and grapes, you get 20RF/tick for 9 seconds. or 40RF/tick for 6 seconds if you use grape salad. The higher food tiers give higher RF/tick. However, looking at the total energy produced, the basic grapes give 540RF total (3 grapes needed to make 1 grape salad) and a grape salad only gives 240RF total. Using a bank of culinary generators is the best way to maximize the total power output as each generator's output would only be 20RF/tick.
We will see how all this turns out...