I'm trying! LOL I've experimented with lentils and tofu (so far, so good). I'm trying to encourage lots of seasonal fruits and veggies right now while they're cheaper. For example, dinner tonight was Alexia fries, sliced tomato, sliced cucumber, carrots, radishes, homemade hummus, and then strawberries for dessert. For the amount of food we ate, the total cost was around $4. The hummus was gifted to us and the fries were bought on a close-out deal.
I continue to watch our meat portions and really try to keep us eating no more than 6 oz a day and most days not even that much. Like tonight's dinner, I encourage some form of vegetarian-type dinner at least once a week, but I've been aiming for 2 lately with the abundance of fresh veggies and such.
And I keep buying the stuff that's not super-expensive, but packs good nutrients -- carrots, bananas, tofu, leafy greens, eggs, berries (seasonally "in" right now), brown rice, oats, etc.