Recipe....
Remove meat from roasting tin.
Pour off excess fat but not the juices leaving a tbs or so of fat.
Add flour and whisk into remaining fat.
Slowly add alcohol, beef/lamb=red wine, pork=cider, chicken=sherry or white wine.
Add stock and whisk all to incorporate. Leave to simmer and thicken lightly.
Add additional flavourings, e.g mustard, horseradish, red currant jelly, herbs depending on your roast.