Olive Oil and citrus (lemon, lime, orange) are great to add to dishes. Find a marinade/ salad dressing or two that you like and use those if you are pressed for time. Find herb blends in the herb aisle (if you can get to a bulk herb section, you won't have to buy as much when youre just trying and it's cheaper.)
Braggs Liquid Aminos is my go to for flavor. I too love lemon juice, olive oil, and garlic in lots of things. Have you made gomashio? Its delicious on your rice. You could make some of the dressing in TKD and have them in the fridge to drizzle throughout the week too.
One thing I've learned making vegan meals for non-vegans is that a handful of aromatics (garlic, onions and fresh herbs) really goes a long way.
I just made these fajitas for dinner the other night and although they would work just fine with raw peppers, avocado slices and black beans straight from the can, it's really worth a few minutes extra minutes to go the full Monty.