Add the quinoa and water (or broth) to a small saucepan. Bring to a boil, then reduce the heat, cover, and simmer for 12-15 minutes, or until the liquid is absorbed. Remove from the heat and let stand for 5 minutes. Fluff with a fork.
To make the BBQ tempeh, heat 1 tbsp olive oil in a large skillet over medium heat. Add the tempeh in a single layer and cook for 3-4 minutes per side, until lightly browned. Reduce the heat to low, add the barbecue sauce, and stir to coat. Cook for 1-2 minutes more, then remove from the heat.
Brush both sides of the zucchini rounds with the remaining 1 tbsp olive oil. Arrange in a single layer on a grill pan or griddle over medium-high heat. Cook for 2-3 minutes per side, pressing lightly with a spatula to create grill marks. Transfer to a plate and season with the salt and pepper.
Make the pineapple salsa by stirring together the pineapple, bell pepper, red onion, cilantro, lime juice, and salt in a medium bowl. Set aside.
Divide the quinoa among 4 bowls. Top with the BBQ tempeh, grilled zucchini, cherry tomatoes, corn, and pineapple salsa. Drizzle with the Green Goddess Dressing and serve.