Slice open the jalapeno and remove the seeds(you can leave some or all for a spicier version).
In a blender or food processor, combine the jalapeños, garlic, cilantro, olive oil, lime juice, honey (if using), salt, red pepper flakes, and cumin (if using).
Pulse until all the ingredients are well-blended into a coarse texture.
Taste the marinade and adjust the seasoning if necessary.
Combine the meat and the marinade and refrigerate for 2 to 24 hours for more flavor.
Once marinated, cook your meat or vegetables as desired, like grilling or stir-frying.
Notes
Adjust: Add another jalapeño or some of its seeds if you want it spicier. If it's too thick, add more olive oil or lime juice to thin it out.Fridge: Keep leftover jalapeno marinade in the refrigerator for up to 3 days.Freezer: Freeze it within 2 hours of making and it'll last up to 3 months.Thawing: Thaw it in the fridge overnight or use the microwave's defrost setting carefully.