Toast almonds in a small skillet over medium heat for a couple of minutes to brown and bring out the flavor.
In a large bowl, combine the spinach, strawberries, almonds, avocado, feta, and onion. Place dressing ingredients to a small bowl and whisk to combine. You can make the dressing ahead of time and store in the refrigerator. Pour over salad right before serving and toss to coat. Serve immediately.
Notes
Source: adapted from my friend Heidi. Added avocado, feta, and onion. Removed onion from the dressing.