We have overcome so many huge things in our marriage, but we need some suggestions for a Mutual agreement in this situation:
This may sound like a petty thing but here goes:
my husband and I are on a very limited budget, sometimes we have to go to the food bank for food.
This is where the problem is:
His work provides lunches for everyone at his work, sometimes several times a week, from restaurants. While I have to scrape together food in our cabinet and forage for whatever I can find to eat. I feel like a second class citizen in our marriage when it comes to this. He eats like a king at work and I have hardly anything to eat at home and no money to buy something to eat.
Our perspectives:
We both know that we need to make this a win, win situation. I think we should both go through this tough time in life together and he doesn't want to give up the food offered at work. He use to ask me to come there for lunch and he would get us both a plate of food, but now he doesn't even tell me when he is getting lunch there. I am feeling resentful. I have explained how I feel but he keeps avoiding working on the issue to come up with a mutual agreement.

If you are not enthusiastic about your husband going out to lunch at a restaurant while he is at work, then he doesn't go out to lunch at a restaurant while he is at work. Period.

As Prisca indicated, the default condition of POJA when you can't agree to a solution is to "do nothing". That means your husband discontinues eating the food at work unless it becomes a health or safety issue. And while you are both doing nothing regarding the lunch meals, you continue negotiation until you are both in agreement.

If he does not "do nothing" by stopping eating the food, he is not following POJA. Following POJA is critical to having a successful marriage.

Doing nothing is uncomfortable. Being uncomfortable works to your good though, because it motivates you to brainstorm solutions.

I may be wrong, but I wonder if there is some issue with openness and honesty on his part about why he discontinued inviting you to lunch.

I also question whether he is meeting your emotional need for financial support. I understand that you see this as a temporary financial condition, but it sounds pretty serious.

Thank you for your reminders. I will talk with him about it. His mother died yesterday so I probably won't bring it up soon. I guess it is all a process and we have come so very far but still working on it.

Sorry for your loss.