Heat large pot of water on high until boiling. Make dressing while waiting for water to boil.
Dice the garlic and leave on the cutting board. Put ¼ tsp of salt on the diced garlic. Using the flat side of your knife by the sharp edge, smash the salt into the garlic then scrape it back into a pile. Keep doing this process until it forms a paste-like texture.
Whisk the garlic paste, lemon zest, lemon juice, Dijon mustard, and red wine vinegar together. Slowly pour the extra virgin olive oil while whisking into the salad dressing. (If you’re pressed for time, a great way to emulsify the dressing ingredients together is to put it in a glass jar, close the lid, and shake vigorously.)
Add ¼ tsp of salt to boiling water and add the orzo. Cook according to package directions, stirring occasionally, until al dente, about 8 minutes. Drain the orzo in the colander, put it in large bowl to cool. Pour half of the dressing and mix well to coat the pasta so it doesn’t stick together, and it absorbs the dressing. Set aside to cool.
Wash, drain, and cut all your vegetables while the orzo cools, reserving them in a separate bowl so the spinach doesn’t wilt.
Put the remaining salad ingredients in the bowl with the orzo. Mix well until the salad dressing evenly coats the ingredients. Keep the salad in the refrigerator until ready to serve.