Shepherd's Pie

2 1/2 lbs yukon gold potatoes, peeled and quartered

1 cup heavy cream

1/2 cup whole butter

1/2 tsp white pepper

1/2 Tbsp chicken or vegetable base

1/2 cup water For the filling:

4 cup minced onions

2 cup 1/4 inch sliced carrots

2 cup 1/4 inch sliced celery

2 Tbsp minced garlic

2 lbs 90% lean ground beef

3 Tbsp coriander

3/4 Tbsp white pepper

1/2 Tbsp kosher salt

1 cup all purpose flour

2 cup frozen peas

1 pint guinness

3 Tbsp beef base

1/2 cup water