Prepare all your ingredients by chopping the onion, crushing the garlic cloves, slicing the hot peppers, and grating all the roots.
Add all of the above plus the zest and juice of the lemon, the cayenne pepper, and the rosemary twigs to a 1L (quart) jar and cover it with Apple Cider Vinegar. All the ingredients should be completely submerged. You can put a little weight on top in case you need it.
Close with the lid and shake well. The lid should not be metal, as the ACV will corrode it over time. However, should you not have a plastic one, you could always put some baking paper or cling film between the jar and the lid (like I have done).
Shake every day (or as often as you remember) for the next 3 to 4 weeks.
Strain all the ingredients using a fine sieve or a cheesecloth, squeezing as much juice as possible.
Add honey to taste, decant in a glass container, and store in a cool, dark place or in the fridge.