Prepare all ingredients as listed above.
Preheat a grill or grill pan to medium heat.
Bring a medium pot of water to a boil.
In a small bowl, prepare the yogurt crema by mixing the Greek yogurt, lime zest, half of the lime juice, grated garlic, smoked paprika, salt, and black pepper until smooth. If needed, add a few drops of the remaining lime juice to thin slightly. Set aside.
Cook the pasta according to the package directions until al dente. Drain, return to the pot, and toss with pesto and Parmesan cheese, if using.
Grill the corn on all sides until tender and nicely charred. Brush with the yogurt crema. Sprinkle with cotija, chili powder, and cilantro.
Brush the sirloin with olive oil and season both sides with salt and black pepper. Grill on both sides to desired temperature. (see below). Let rest for 2 - 3 minutes before slicing.
Prepare the lemon chia sparkling water by combining the sparkling water, lemon slices, and chia seeds. Stir well and let sit 3 - 5 minutes for the chia to bloom. Serve over ice if preferred.
Serve the steak with pesto pasta, grilled elote, watermelon, and lemon chia sparkling water.