With everything going on in the world right now you either got a stretch a dollar and or you are stuck at home. Regrowing vegetables from kitchen scraps is simple. Save money, pass time, have food to eat. This is good to teach to children as well. You will need a area with a window that gets good sunlight, water and soil at minimum. See below list of plants that I have grown before. I have used left overs of lettuce that cost around 10 dollars and grown the stumps for around a year never having to buy lettuce.
1. Romaine Lettuce-Simply place the left over stump in a bowl of water around 1/2 inch deep of water. And keep by window that gets good sunlight. Maintain water level(replace with new water every 2 days)until roots and growth appears and transfer into soil/grow medium. Deep water culture system works very well with lettuce. See DIY DWC for more info. Use a storage tote for multiple plants instead of bucket.
2. Celery-Simply place the left over stump in a bowl of water around 1/2 inch deep. And keep by window that gets good sunlight. Maintain water level until roots and growth appear and transfer into soil/grow medium.
3. Green Onion. When cutting for use cut around 1″ above the roots. Place in cup of water and watch regrow. Maintain water level and replace with new water weekly.
There is many more plants that you can regrow from left over scraps. As long as you have any area that can make roots.