Whisk together jalapenos, green onions, cilantro, agave nectar, garlic, lime juice. Slowly drizzle in olive oil, whisk until well blended. Season with salt and pepper.
Cut Watermelon into squares (see video above for demonstration). Slice tomatoes.
In a medium bowl, toss baby spring mix with vinaigrette & season with salt.
For each serving, place one watermelon slice on a plate, place some dressed spring mix onto watermelon. Top with tomatoes, cheese & sweet onions. Drizzle additional dressing over each serving. Season with salt and pepper.