Divide the ingredients (except for the peaches and cilantro) into 3 batches so they will fit into a food processor. For each batch, halve or quarter 4 cloves garlic, 2 onions, 2 jalapenos and 2 bell peppers and throw into a food processor. Add 1 teaspoon each chili powder, salt and pepper. Squeeze in the juice from 4 limes and pulse. Pour the salsa into a very large container and repeat with the remaining 2 batches.
Cut the peaches into small chunks, add to the salsa and mix. Mix in the cilantro. If your salsa is a little thick, loosen it with some of the syrup from the peaches.
This is a large-quantity recipe for feeding a crowd, but it can be scaled down quite easily.
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