Warm the avocado oil in a small skillet over low heat. Sprinkle in the cumin and stir just until fragrant, 30–45 seconds (do not sizzle). Remove from heat and let the oil cool to room temperature.
On a cutting board, combine the cilantro, jalapeño, and lime zest with the kosher salt. Chop and gently mash the mixture with the side of your knife until the herbs look bruised and very fine.
In a medium bowl, whisk the lime juice with the honey until the honey dissolves. Scrape in the chopped herb mixture and stir to combine.
While whisking steadily, slowly stream in the cooled cumin oil until the vinaigrette lightly emulsifies yet still shows a few flecks of cilantro. Taste and adjust with a pinch more salt or a squeeze of lime as needed.
Transfer to a jar and let stand 10 minutes before serving to let the flavors bloom. Shake well before each use.