Clam chowder from Grandma Carol

Combine:
3 cans juice from clams
potatoes- cubed
carrots
onions
enough water to cover vegetables
Bring to a boil and cook until vegetables are tender

Make a roux:
1 cube butter
1/2 c flour

Add:
2 qts half and half or 1/2 gal whole milk

Add liquid to vegetables then add the clams