Preheat a gas grill to 425 degrees. Brush both sides of salmon with the 1 Tbsp olive oil. Season both sides of salmon with salt, pepper and the cumin.
Brush grill grates with oil, place salmon on grill and grill about 3 minutes per side, or to desired doneness. Serve salmon immediately topped with avocado chimichurri.
For the chimichurri:
In a small mixing bowl toss together all chimichurri ingredients while seasoning with salt and pepper to taste.
*You can replace the 2 Tbsp water with 2 more Tbsp evoo if desired. I made this twice and liked that the water version wasn't so heavy. I just felt there was already enough fat and richness from the avocado and salmon that it didn't need more oil. Normally I would not add water to chimichurri.