Summer Burger with Avocado, Red Onion, Horseradish Sour Cream Sauce & Dijon Mustard Mayonnaise

INGREDIENTS

1 lb

good quality, coarsely ground beef, chilled

medium onion, finally chopped

garlic clove, crushed

1 tbsp

fresh parsley, chopped

1 tsp

Worcestershire sauce

1 tsp

smoked paprika

egg

salt and freshly ground pepper

1/2 cup

sour cream

1 tbsp

creamed horseradish

1 tbsp

chopped fresh chives

1/2 cup

mayonnaise

1 tbsp

Dijon mustard

salt and freshly ground pepper

burger buns, halved and toasted

red onion rings

avocado, sliced