1. Add basil, oil, 1/4 cup of the hempseeds, cheese, lemon juice, lemon zest, garlic, salt and pepper to food processor; purée until smooth.
2. Using a spiralizer, turn zucchini into long strands, trimming with clean kitchen shears, if necessary.
3. Toss zucchini strands and halved grape tomatoes (if using) with pesto. Let stand for 5 to 10 minutes or until zucchini softens.
4. Divide among 4 dishes; sprinkle with additional hempseeds if desired.