I save all my veggies scraps in a zip bag in the freezer and once a week I make veggie broth in a large stock pot. I use the broth for making beans, rice, a base for salad dressing, in place of oil when sautéing, etc. It's also delicious on its own.
I make my own alternative milks in my soyabella. I do some mix of almonds, cashews, pistachios, chia seeds, flax seeds, oats, maca... whatever is in the pantry. Will add a little vanilla and maple syrup on occasion.
I just started making my own BBQ sauce after going to the store last week and reading the ingredients on a bottle of annie's brand sauce. I realized I had all the ingredients in my house, so I tried it out, and it turned out better than store bought.
I make my own hummus, but it's never as good as store bought since I don't use tahini. I'm a little sensitive to sesame seeds, so I try to avoid it. If anyone has any suggestions for making a creamier, thicker hummus, but without the tahini, let me know!