Lunch

Warm Lentils with Smoked Mackerel and Beetroot

Name: Warm Lentils with Smoked Mackerel and Beetroot
Prep time: 10 min
Total time: 10 min
Yield: 1 serving
Ingredients: 180 g Cooked lentils; 80 g Smoked mackerel; 100 g Cooked beetroot; 30 g Red onion; 1 tsp, about 6 g Dijon mustard; 2 tsp, about 12 g Creamed horseradish; 5 g Olive oil; A splash Cider vinegar; A handful, chopped Fresh parsley

Warmed lentils dressed with mustard and vinegar, with flaked smoked mackerel, beetroot and a spoon of horseradish. Ten minutes and 34 g of protein.

Calories: 576kcal
Protein: 34g
Fat: 28g
Carbs: 49g

Per serving, makes 1. 10 minutes of work. Published 8 September 2026.

Allergens

Milk
Eggs
Fish
Mustard

Creamed horseradish is made with cream and often egg yolk. Plain grated horseradish carries neither.

Flags follow UK labelling rules and come from the ingredients as listed, not from any particular brand. Check the packet before cooking for somebody with an allergy.

Ingredients

Cooked lentils180 g
Cooked weight, green or brown. A pouch is already this.
Smoked mackerel80 g
As sold. Most of the fat in any dish it is in.
Cooked beetroot100 g
Vacuum-packed, not pickled. Pickled beetroot carries vinegar and usually sulphites.
Red onion30 g
Dijon mustard1 tsp, about 6 g
Creamed horseradish2 tsp, about 12 g
Olive oil5 g
Cider vinegarA splash
Fresh parsleyA handful, chopped

Method

Warm the lentils in a pan with a splash of water for three minutes.
Stir in the mustard, oil, vinegar, the red onion sliced very thin, and the parsley. Season.
Flake the mackerel over the lentils, skin removed, and add the beetroot in wedges. Spoon the horseradish on top.

Worth knowing

Smoked mackerel is 300 kcal per 100 g and 25 g of fat, so 80 g is deliberate. It is a strong fish and that amount is enough against 180 g of lentils.
A pouch of ready-cooked lentils is 250 g; the remaining 70 g goes in tomorrow's salad. Dressing them warm is what makes them take the mustard.

Other lunch recipes that share ingredients with this one, or every lunch between 450 and 600 calories a serving.

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Macros are calculated from the weights listed above using standard food composition values, and will shift with your own brands and measuring. Weigh what you can. This is a recipe, not dietary advice. The full health disclaimer is below.