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To make the smoky lime pepitas, preheat your oven to 325°F (165°C) with the rack placed in the middle position, and line a rimmed baking sheet with parchment paper or a non-stick silicone liner.
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In a medium bowl, combine the pepitas, olive oil, salt, paprika, and cayenne. Add the lime juice and mix well.
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Spread the seasoned pepitas in a single layer on the prepared baking sheet.
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Toast the seeds for 12 to 15 minutes in the oven, stirring at the halfway point, until fragrant and crunchy. Allow to cool.
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To assemble the salad, soak the sliced onion in a bowl of iced water for about 10 minutes to mellow the flavor, drain, and discard soaking liquid.
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In a large bowl, combine the watermelon, cucumber, drained onions, olive oil, chile powder, salt, cayenne pepper, lime zest, and lime juice, and toss to coat evenly. Tweak flavors to taste.
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Garnish with fresh mint leaves and 1/4 cup toasted pepitas. Serve immediately.