Any suggestions? We’re self isolating and have no bisto. DD is vegetarian. I want to do a roast of sorts for Easter (only have chicken breasts though as running a bit low on food- Sunday will be day 14 for DH but he’s not well enough to shop, and only day 5 of symptoms for me). What can I use to make gravy or a substitute? Very limited ingredients left (stock cubes, plain flour, herbs, spices etc)