Eat the same thing every day. If your goal is to gain weight and you're not doing so, increase calories by 5% for that week. Aim for 1lb of weight gain a week or half that for women. Likewise if your goal is to lose fat and you're not doing so, decrease calories by 5% for that week. Again aim for 1lb of weight loss a week and half that for women.
If your diet is red meat, bone broth and rice - this is as simple as adding / removing rice as required.